Test socket with insertion portion

A test socket comprising:

• a housing-part main body formed with a device housing portion for housing a test device and to be mounted on a board;
• a pressing body pressing the test device housed in the device housing portion in a direction toward the board;
• a lid-part main body holding the pressing body while allowing reciprocating movement in the direction toward and from the board, and to be connected to the housing-part main body;
• an engaging member attached to the lid-part main body so that the engaging member is swingable with an intermediate point as a pivot axis, the engaging member having a distal end portion coming into engagement with the housing-part main body, and a proximal end portion approaching and separating from an opposing surface of the lid-part main body;
• and
• an insertion portion to be inserted into a gap between the proximal end portion and the opposing surface of said lid-part main body,
• the insertion portion is inserted into the gap from a position retracted from the gap according to an action of the pressing body pressing the test device in the direction toward the board.