To provide an electronic parts positioning mechanism which can easily and surely set electronic parts on a socket for inspecting electronic parts by improving operability and, at the same time, can be made compact as a whole and a socket for inspecting electronic parts provided with the mechanism.

A regulating member 20 is provided in such a way that the member 20 can move in a direction which is almost perpendicular to the moving direction of an contacting/separating member 18 and, at the same time, an engaging section 33 for separation which engages the member 18 with the regulating member 20 at a position separated from electronic parts 2 and an engaging section 32 for pressing which engages the member 18 with the regulating member 20 at a position where the parts 2 are made to press the member 18 are formed. In addition, a using member 21 for switching engaging section with urges the engaging sections 32 and 33 in the direction perpendicular to the moving direction of the member 18 is provided.