A terminal connecting mechanism for a molded case circuit breaker, the mechanism comprising: a supporter that has a through hole portion for allowing passing through of a terminal of the molded case circuit breaker and a terminal seat portion (32f, 32c) where the terminal, which has passed through the through hole portion, can be mounted; a spring, wherein one end of the spring is supported by the supporter; and a lever member that is in contact with the other end of the spring, rotatable to a position for allowing insertion of a wire to contact the terminal, and pressurizes the wire by means of an elastic force of the spring to maintain a contact state between the wire and the terminal, wherein the lever member has a spring supporting seat portion for supporting the other end of the spring, the supporter has a spring supporting seat portion for supporting one end of the spring, and the spring supporting seat portion of the supporter is located at a height higher than a height of the spring supporting seat portion of the lever member at an assembly state, wherein the terminal seat portion (32f, 32c) that provides a mounting space for the terminal has a bottom portion and two sidewall portions formed to be extended from both sides of the bottom portion at a predetermined height; characterized in that the supporter further comprises a vertical wall portion that is formed to be upwardly extended from the rear of the bottom portion and has the spring supporting seat portion for supporting one end of the spring at a predetermined position; and in that the through hole portion is provided at the vertical wall portion and allows passing through of the terminal. a supporter that has a through hole portion for allowing passing through of a terminal of the molded case circuit breaker and a terminal seat portion (32f, 32c) where the terminal, which has passed through the through hole portion, can be mounted; a spring, wherein one end of the spring is supported by the supporter; and a lever member that is in contact with the other end of the spring, rotatable to a position for allowing insertion of a wire to contact the terminal, and pressurizes the wire by means of an elastic force of the spring to maintain a contact state between the wire and the terminal, wherein the lever member has a spring supporting seat portion for supporting the other end of the spring, the supporter has a spring supporting seat portion for supporting one end of the spring, and the spring supporting seat portion of the supporter is located at a height higher than a height of the spring supporting seat portion of the lever member at an assembly state, wherein the terminal seat portion (32f, 32c) that provides a mounting space for the terminal has a bottom portion and two sidewall portions formed to be extended from both sides of the bottom portion at a predetermined height; characterized in that the supporter further comprises a vertical wall portion that is formed to be upwardly extended from the rear of the bottom portion and has the spring supporting seat portion for supporting one end of the spring at a predetermined position; and in that the through hole portion is provided at the vertical wall portion and allows passing through of the terminal.