A board connector (1) has a housing (10) and terminal fittings (20) penetrate through the back wall (11) of the housing (10). A board connecting portion (21) of each terminal fitting (20) penetrates through the back wall (11) and is solder-connected to a board (2). The housing (10) has a heat transfer inhibiting portion for inhibiting heat transfer to the back wall (11). The heat transfer inhibiting portion has a through-hole (13) or heat-insulating grooves (17) in the back wall (11). As a result, heat transfer to the back wall (11) is inhibited and deformation of the back wall (11) due to thermal expansion also is inhibited. Consequently, it is possible to prevent the terminal fittings (20) from separating from the board (2) and going into a state of being not solder-connected thereto.