Abstract: An aspect of the present invention makes it possible to easily observe both surfaces of a cell sheet in a condition in which the cell sheet is at a stable position in a culture medium. A cell sheet production device (100) includes: a container (20); and a support unit (10) removably held in the container (20), the support unit (10) including a mesh sheet (2) and a base (3) which holds the mesh sheet (2) such that the mesh sheet (2) floats from a bottom surface of the container (20), the support unit (10) being held in the container (20) such that the support unit is at a fixed position in vertical and horizontal directions in a culture medium.

Abstract: An electromagnetic switch for a starter motor is disclosed in which powder produced by friction from repeated opening and closing of the stationary and movable contacts is prevented from entering in between the sliding parts of the movable iron core assembly, thus ensuring the smooth sliding motion of the movable iron core assembly at all times, and in which the penetration of external water into the space defined by the stationary and movable iron cores and the shaft member is effectively prevented thereby to avoid various troubles resulting therefrom.