A charging connector (B,B1,B2) comprising: a connector case main body; a lever received in the connector case main body, and of which center part is pivotally supported; a locking claw integrally formed with one end of the lever; and a release button disposed at the other end of the lever and having a bottom wall, wherein when the charging connector (B,B1,B2) is completely fitted into a secondary battery-side connector connected to a secondary battery, the locking claw is locked with a locking projection provided at the secondary battery-side connector, and wherein when the release button is pushed down, the lever is rotated around a shaft supporting point to release the locking between the locking claw and the locking projection, and the charging connector (B,B1,B2) being characterized by: a lock system having a lock device attached to the connector case main body, and an operation regulator which is moved to a preventing position to prevent the release button from being pushed down when the lock device is in a locking state, and moved to an allowing position to allow the release button to be pressed down when the lock device is in an unlocking state, wherein a tip end of the operation regulator is moved to contact an end of the bottom wall of the release button, when the lock device is in a locking position, and wherein the tip end of the operation regulator is moved to far from the bottom wall of the release button, when the lock device is in an unlocking position. a connector case main body; a lever received in the connector case main body, and of which center part is pivotally supported; a locking claw integrally formed with one end of the lever; and a release button disposed at the other end of the lever and having a bottom wall, wherein when the charging connector (B,B1,B2) is completely fitted into a secondary battery-side connector connected to a secondary battery, the locking claw is locked with a locking projection provided at the secondary battery-side connector, and wherein when the release button is pushed down, the lever is rotated around a shaft supporting point to release the locking between the locking claw and the locking projection, and the charging connector (B,B1,B2) being characterized by: a lock system having a lock device attached to the connector case main body, and an operation regulator which is moved to a preventing position to prevent the release button from being pushed down when the lock device is in a locking state, and moved to an allowing position to allow the release button to be pressed down when the lock device is in an unlocking state, wherein a tip end of the operation regulator is moved to contact an end of the bottom wall of the release button, when the lock device is in a locking position, and wherein the tip end of the operation regulator is moved to far from the bottom wall of the release button, when the lock device is in an unlocking position. a lock system having a lock device attached to the connector case main body, and an operation regulator which is moved to a preventing position to prevent the release button from being pushed down when the lock device is in a locking state, and moved to an allowing position to allow the release button to be pressed down when the lock device is in an unlocking state, wherein a tip end of the operation regulator is moved to contact an end of the bottom wall of the release button, when the lock device is in a locking position, and wherein the tip end of the operation regulator is moved to far from the bottom wall of the release button, when the lock device is in an unlocking position.