A connector (10) includes a device-side connector (30) and a wire-side connector (11). The device-side connector (30) includes a device-side receptacle group (35) formed by stacking a plurality of device-side receptacles (36) having an opening (36C) on a front side in a connecting direction. The wire-side connector (11) includes wire-side terminals (17), terminal accommodating portions (20) and an accommodation case (12) configured to hold the terminal accommodating portions (20) movably in a direction intersecting with the connecting direction. The opening (36C) of an end device-side receptacle (36A) arranged on one end part includes a guiding protrusion (42) projecting in a stacking direction and configured to guide the corresponding terminal accommodating portion (20) in a proper connection posture into the end device-side receptacle (36A), whereas the accommodation case (12) includes a receiving portion (13) configured to receive the guiding protrusion (42).