Motor, and inverter-integrated rotating electric machine

A motor, comprising:

• a motor body having a rotor that is rotatable around an axis and a stator that surrounds the rotor;
• a casing that has a cylinder portion and a housing portion, the cylinder portion forming a cylindrical shape extending in an axial direction and surrounding the motor body, internally having a flow channel that extends in a C shape in a circumferential direction, having a first end serving as an inflow port and a second end serving as an outflow port, and being used for allowing cooling water to flow, the housing portion overhanging on both sides of the cylinder portion in a tangential direction on an outer peripheral side of the flow channel in the cylinder portion;
• and
• an inverter that is housed in the housing portion and has a switching element disposed on a surface of the cylinder portion facing radially outward in the housing portion.