Fixing structure of circuit board and pump device

A fixing structure for a circuit board, the fixing structure comprising:

• a circuit board formed as a rigid board in a flat disc shape, the circuit board including a “U”-shaped cut-out part which is recessed from an outer peripheral edge of the circuit board towards a center of the circuit board;
• a board fixing member including a protruding part extending in a thickness direction of the circuit board, and a screw hole defined by the protruding part;
• and
• a fixing screw including a shaft part configured to engage the screw hole so as to fix the circuit board to the board fixing member,
• wherein an end of the protruding part includes a flat board contact face configured to contact a first axial side of the circuit board, and a positioning protruded part extending from the board contact face so as to engage the cut-out part such that the circuit board is rotationally positioned with respect to the board fixing member,
• wherein the screw hole is recessed from the board contact face,
• wherein the shaft part of the fixing screw extends through the cut-out part,
• wherein a head part of the fixing screw is configured to contact a second axial side of the circuit board, and
• wherein the positioning protruded part is disposed between the screw hole and the outer peripheral edge of the circuit board.