Abstract: Tank closure, especially for a motor vehicle, with a supporting part mounted on the tank in the peripheral area of a filling opening and receiving an actuating element which is rotatable around an axis that is approximately parallel to the central axis of filling opening. The actuating element is rotatable manually and/or by a filling arm of an automatic filling device into an open position that opens filling opening and in the opposite direction into a closed position that closes filling opening. A closing part guided approximately rectilinearly is located between supporting part and actuating element. The closing part is adjustable through an adjusting device by actuating element which opens filling opening when rotated to the open position, and which closes filling opening when rotated to the closed position.