An action member is movable between a first position at which a unit bias member is sandwiched between the action member and a heating unit and a second position. A movement mechanism operates in conjunction with a movement of an operation portion to cause the action member to move from one of the first position and the second position to another one of the first position and the second position. A contact portion of the heating unit comes into contact with a fixing unit by a bias force received from the unit bias member when the action member is at the first position. The action member includes an engagement portion which engages with a part of the heating unit when the action member moves from the first position to the second position. The heating unit engages with the engagement portion to move from a reference position to an evacuation position.