A socket for mounting an electronic component that can connect an electronic component always in a correct orientation is provided. Socket-side engaging parts (9) are provided at a plurality of places of a peripheral wall (3) of a socket housing (5) having an electronic component accommodating part (4) that is surrounded by the peripheral wall (3) raised from the four side parts of a quadrangle-shape bottom plate (2). The socket-side engaging parts (9) include elastic fixing pieces whose fixing protrusions (9a) at the tip ends are locked in the bottom parts of respective locking recessed parts of the peripheral wall of the electronic component (6). An electronic component is held in the electronic component accommodating part (4) by these socket-side engaging parts (9). In one side part (3d) of opposing two side parts (3b), (3d) of the peripheral wall (3) of the four side parts (3a), (3b), (3c), (3d) of the socket housing (5), plural socket-side engaging parts (9) are arranged closer to the both end sides thereof with an interval in between, and in the remaining other side part (3b), one or plural socket-side engaging parts are arranged closer to the center side thereof adjacent to each other.