A circuit board electrical connector to be disposed on a circuit board includes a housing and a plurality of terminals arranged in the housing. The housing includes a receiving space with an upper opening portion to receive a flat conductive member and a housing space with a lower opening portion that communicates with the receiving space. Each of the terminals has a connecting section and a contact section. The circuit board electrical connector has a portion to house a middle section of the terminal between the connecting section and the contact section. The portion is a region includes a range that overlaps at least with the upper opening portion and lower opening portion when viewed from an upper side, and is made wider at a gap between an inner surface of the housing space and the terminal than a gap other than the region.