A sealing device, comprising: - a pressure member having a pressure element for pressing a sealed portion of a sealed object; - a heating member having a heating element for heating the sealed portion; - a nozzle part arranged to be insertable into the sealed object from an opening in the sealed portion to suck out gas from inside of the sealed object or supply gas into the sealed object; - a nozzle drive unit allowing the nozzle part to move between a waiting position (41 a) and a stop position; and - a first linear solenoid for driving the pressure member such as to hold the sealed portion between the pressure member and the heating member; characterized in that the device further comprises: - a stopping mechanism for stopping a movement of a first movable part that forms the first linear solenoid when the first linear solenoid is driven at a predetermined midway point between a start point and an end point after the nozzle part has been moved from the waiting position to the stop position, and for releasing the first movable part from a stop to allow the first movable part to move again and reach the end point after the nozzle part has been returned from the stop position to the waiting position (41 a); wherein the stopping mechanism further includes - a second linear solenoid arranged adjacent to the first linear solenoid; - a pin secured at one end to a first movable part of the first linear solenoid and moving relative to the second linear solenoid inside a first bore that extends through a second movable part of the second linear solenoid; - a midway positioning portion extended from the second movable part of the second linear solenoid toward the first movable part of the first linear solenoid and formed with a second bore continuing from the first bore; - a lock part that engages with a recess of the pin formed at a different end from the one end of the pin to stop the pin from moving when a distal end portion of the first movable part of the first linear solenoid makes contact with the distal end portion of the midway positioning portion to stop the first movable part of the first linear solenoid at the midway point; and - a lock release part that is adapted to release engagement of the recess by entering between the lock part and the pin when a second movable part of the second linear solenoid has moved with the first movable part of the first linear solenoid having moved to the end point. - a pressure member having a pressure element for pressing a sealed portion of a sealed object; - a heating member having a heating element for heating the sealed portion; - a nozzle part arranged to be insertable into the sealed object from an opening in the sealed portion to suck out gas from inside of the sealed object or supply gas into the sealed object; - a nozzle drive unit allowing the nozzle part to move between a waiting position (41 a) and a stop position; and - a first linear solenoid for driving the pressure member such as to hold the sealed portion between the pressure member and the heating member; - a stopping mechanism for stopping a movement of a first movable part that forms the first linear solenoid when the first linear solenoid is driven at a predetermined midway point between a start point and an end point after the nozzle part has been moved from the waiting position to the stop position, and for releasing the first movable part from a stop to allow the first movable part to move again and reach the end point after the nozzle part has been returned from the stop position to the waiting position (41 a); - a second linear solenoid arranged adjacent to the first linear solenoid; - a pin secured at one end to a first movable part of the first linear solenoid and moving relative to the second linear solenoid inside a first bore that extends through a second movable part of the second linear solenoid; - a midway positioning portion extended from the second movable part of the second linear solenoid toward the first movable part of the first linear solenoid and formed with a second bore continuing from the first bore; - a lock part that engages with a recess of the pin formed at a different end from the one end of the pin to stop the pin from moving when a distal end portion of the first movable part of the first linear solenoid makes contact with the distal end portion of the midway positioning portion to stop the first movable part of the first linear solenoid at the midway point; and - a lock release part that is adapted to release engagement of the recess by entering between the lock part and the pin when a second movable part of the second linear solenoid has moved with the first movable part of the first linear solenoid having moved to the end point.