A gradient magnetic field coil device (2) has a main coil device (3) shaped by embedding a plurality of main coils (3z) for generating a gradient magnetic field and a leakage magnetic field in a first resin (3a), and a shield coil device (4) shaped by embedding a plurality of shield coils (4z) for suppressing the leakage magnetic field in a second resin (4a). The shield coil device (4) is provided with a facing region (A1) facing the main coil device (3) and fixed to the main coil device (3), and a protruding region (A2) protruding from the main coil device (3), and an insulating reinforcing material (5) is embedded in the second resin (4a) in the protruding region (A2). A plurality of the reinforcing material (5) are arranged in the circumferential direction of the shield coil device (4), and the second resin (4a) is preferably filled in between reinforcing materials (5) that are adjacent to each other. The reinforcing materials (5) are preferably arranged on the main coil device (3) side with respect to the shield coils (4z).