A connector including a first connector and a second connector configured to face each to fit together. The first connector includes a first internal terminal including terminals along a longitudinal direction, a first insulating member supporting the first internal terminal, and first external terminals at two ends of the first internal terminal in the longitudinal direction. The second connector includes a second internal terminal including terminals along a longitudinal direction and that engages with the first internal terminal, a second insulating member supporting the second internal terminal, and second external terminals at two ends of the second internal terminal in the longitudinal direction. The first connector includes projecting portions that project further toward the second connector than the first internal terminal does in a fitting direction. The second connector includes recesses that accommodate the projecting portions and guiding portions, each being in a vicinity of one of the recesses.