An interface connector makes parts to be fitted by insertion hold the state where a receptacle and a plug are fitted, and removes the plug easily from the receptacle when load is applied to the plug from a direction other than the insertion direction. In the interface connector (10), the plug (100) has an inserting projection part (114) in which a plurality of plug terminals (120) are disposed in upper and lower faces (114b and 114c). The inserting projection part (114) is provided with a plurality of plug terminals (120) that project freely moving in and out of the upper and lower faces (114b and 114c) of the insertion projection part (114) by elastic deformation, and, when the inserting projection part (114) is inserted in the insertion slot (212) of the receptacle (200), a plurality of plug terminals (120) press against a plurality of receptacle terminals (220) provided in the receptacle (200) such that the insertion projection part (114) is held removably in receptacle (200) and is removed from the receptacle (200) when load is applied from a direction other than the insertion direction.