diff --git a/src/interpreter/objects.rs b/src/interpreter/objects.rs
index c90d1e53..1588f58f 100644
--- a/src/interpreter/objects.rs
+++ b/src/interpreter/objects.rs
@@ -17,6 +17,64 @@ impl NyashInterpreter {
         -> Result<Box<dyn NyashBox>, RuntimeError> {
         // 組み込みBox型のチェック
         match class {
+            // Basic Box constructors (CRITICAL - these were missing!)
+            "StringBox" => {
+                // StringBoxは引数1個（文字列値）で作成
+                if arguments.len() != 1 {
+                    return Err(RuntimeError::InvalidOperation {
+                        message: format!("StringBox constructor expects 1 argument, got {}", arguments.len()),
+                    });
+                }
+                let value = self.execute_expression(&arguments[0])?;
+                let string_value = value.to_string_box().value;
+                let string_box = Box::new(StringBox::new(string_value)) as Box<dyn NyashBox>;
+                return Ok(string_box);
+            }
+            "IntegerBox" => {
+                // IntegerBoxは引数1個（整数値）で作成
+                if arguments.len() != 1 {
+                    return Err(RuntimeError::InvalidOperation {
+                        message: format!("IntegerBox constructor expects 1 argument, got {}", arguments.len()),
+                    });
+                }
+                let value = self.execute_expression(&arguments[0])?;
+                if let Some(int_box) = value.as_any().downcast_ref::<IntegerBox>() {
+                    let integer_box = Box::new(IntegerBox::new(int_box.value)) as Box<dyn NyashBox>;
+                    return Ok(integer_box);
+                } else {
+                    // Try to parse from string or other types
+                    let int_value = value.to_string_box().value.parse::<i64>()
+                        .map_err(|_| RuntimeError::TypeError {
+                            message: format!("Cannot convert '{}' to integer", value.to_string_box().value),
+                        })?;
+                    let integer_box = Box::new(IntegerBox::new(int_value)) as Box<dyn NyashBox>;
+                    return Ok(integer_box);
+                }
+            }
+            "BoolBox" => {
+                // BoolBoxは引数1個（真偽値）で作成
+                if arguments.len() != 1 {
+                    return Err(RuntimeError::InvalidOperation {
+                        message: format!("BoolBox constructor expects 1 argument, got {}", arguments.len()),
+                    });
+                }
+                let value = self.execute_expression(&arguments[0])?;
+                if let Some(bool_box) = value.as_any().downcast_ref::<BoolBox>() {
+                    let bool_box_new = Box::new(BoolBox::new(bool_box.value)) as Box<dyn NyashBox>;
+                    return Ok(bool_box_new);
+                } else {
+                    // Try to convert from string or other types
+                    let bool_value = match value.to_string_box().value.to_lowercase().as_str() {
+                        "true" => true,
+                        "false" => false,
+                        _ => return Err(RuntimeError::TypeError {
+                            message: format!("Cannot convert '{}' to boolean", value.to_string_box().value),
+                        }),
+                    };
+                    let bool_box_new = Box::new(BoolBox::new(bool_value)) as Box<dyn NyashBox>;
+                    return Ok(bool_box_new);
+                }
+            }
             "ArrayBox" => {
                 // ArrayBoxは引数なしで作成
                 if !arguments.is_empty() {
diff --git a/test_basic_box_comprehensive.nyash b/test_basic_box_comprehensive.nyash
new file mode 100644
index 00000000..de1ac467
--- /dev/null
+++ b/test_basic_box_comprehensive.nyash
@@ -0,0 +1,46 @@
+// Comprehensive test to verify Basic Box constructors work identically to literals
+// This demonstrates that Problem 1 is fully resolved
+
+local console = new ConsoleBox()
+console.log("=== Comprehensive Basic Box Constructor Test ===")
+
+// Test StringBox equivalence
+local str_box = new StringBox("test")
+local str_literal = "test"
+console.log("StringBox toString: " + str_box.toString())
+console.log("String literal: " + str_literal)
+console.log("StringBox == literal: " + (str_box.toString() == str_literal))
+
+console.log("---")
+
+// Test IntegerBox equivalence  
+local int_box = new IntegerBox(123)
+local int_literal = 123
+console.log("IntegerBox toString: " + int_box.toString())
+console.log("Integer literal: " + int_literal)
+console.log("IntegerBox == literal: " + (int_box.toString() == int_literal.toString()))
+
+console.log("---")
+
+// Test BoolBox equivalence
+local bool_box = new BoolBox(true)
+local bool_literal = true
+console.log("BoolBox toString: " + bool_box.toString())
+console.log("Bool literal: " + bool_literal)
+console.log("BoolBox == literal: " + (bool_box.toString() == bool_literal.toString()))
+
+console.log("---")
+
+// Test type conversion capabilities
+local str_from_int = new StringBox(456)
+console.log("StringBox from int: " + str_from_int.toString())
+
+local int_from_str = new IntegerBox("789")
+console.log("IntegerBox from string: " + int_from_str.toString())
+
+local bool_from_str_true = new BoolBox("true")
+local bool_from_str_false = new BoolBox("false")
+console.log("BoolBox from 'true': " + bool_from_str_true.toString())
+console.log("BoolBox from 'false': " + bool_from_str_false.toString())
+
+console.log("=== All Basic Box Constructors Working! ===")
\ No newline at end of file