An interposer includes a housing and a contact disposed in the housing. The housing has a first face, a second face opposite the first face, and a passageway penetrating the first face and the second face. The contact has a base portion press-fitted in the passageway, a first contact beam extending obliquely with respect to the first face from the base portion, and a second contact beam extending obliquely with respect to the second face from the base portion. The first contact beam extends outward beyond the first face and has a first contact point portion. The second contact beam extends outward beyond the second face and has a second contact point portion. The first contact point portion and the second contact point portion both extend beyond a penetrated region of the passageway in a direction perpendicular to an insertion direction in which the contact is inserted into the passageway.