Block and contact block

A block comprising:

• two contactors which are arranged adjacent to each other along a predetermined installation direction to be electrically connected to each other;
• and
• a support member configured to support the two contactors so as to be arranged along the predetermined installation direction,
• wherein the support member is provided with a slit configured to allow a detachable circuit board to be inserted between the two contactors along an insertion direction that is orthogonal to the predetermined installation direction, in order to electrically connect the detachable circuit board and the two contactors,
• the two contactors have a substantially U-shape that opens toward a direction opposite to the insertion direction when viewed from a direction orthogonal to the predetermined installation direction and the insertion direction, and
• a first wall portion is provided on the support member, the first wall portion being configured to prevent a contact point between the two contactors from being dislocated in the predetermined installation direction.