Opening/closing device

An opening/closing device comprising:

• an opening/closing mechanism which moves a movable plate between an opened position and a closed position with respect to a fixed plate,
• the opening/closing mechanism including
• a hinge arm including a first axial portion rotatably connected to the fixed plate, a third axial portion rotatably connected to the movable plate, and a slide groove provided between the first axial portion and the third axial portion, and capable of moving the movable plate between the closed position and the opened position with respect to the fixed plate by being rotated around the first axial portion as a center,
• a link arm including a second axial portion rotatably connected to the fixed plate and a fifth axial portion slidably connected to the slide groove, and
• a slide arm including a fourth axial portion rotatably connected to the movable plate at an end portion and connected to the fifth axial portion at the other end portion, and
• wherein when the movable plate is moved between the closed position and the opened position, the fifth axial portion is slid in the slide groove in accordance with rotations of the hinge arm and the link arm, and surfaces of the first housing and the second housing are positioned at substantially the same plane when the movable plate is moved to the opened position.