A connector has a housing and an internal structural body. The housing has a receiving portion while the internal structural body has contacts. The housing has a second upper inner wall surface and a second lower inner wall surface which define a rear portion of the receiving portion. Each of the second upper inner wall surface and the second lower inner wall surface is formed with contact accommodation portions which individually accommodate the contacts. The contact accommodation portions are grooves extending in a mating direction and opening to a front portion of the receiving portion at least in part. Each of the contacts has a spring portion which is resiliently deformable and a contact point supported by the spring portion. The contact point is situated inside the rear portion when the connector is separated from the mating connector.