Drive device and electric power steering device

A drive device comprising:

• a motor that includes a motor main body having a rotor and two sets of windings that cause the rotor to rotate by allowing a current to flow through the two sets of windings, a frame configured to accommodate the motor main body, and a housing fitted to the frame;
• and
• a control unit attached to the motor and configured to control the current supplied to the two sets of windings,
• wherein the control unit includes:
• a wiring board having a first surface facing the housing and a second surface opposite to the first surface;
• a first inverter circuit and a second inverter circuit configured to independently supply the current to each of the two sets of windings;
• and
• a CPU configured to control the first inverter circuit and the second inverter circuit,
• wherein a first switching element constituting the first inverter circuit is disposed on the first surface of the wiring board, and
• wherein a second switching element constituting the second inverter circuit is disposed on the second surface of the wiring board,
• wherein a thermal connecting member configured to thermally connect the housing and the wiring board is provided between the housing and the wiring board,
• a thermal conductive member disposed to penetrate from the first surface to the second surface and thermally connected to the thermal connecting member is provided on the wiring board,
• the first switching element is thermally connected to the housing via the thermal connecting member, and
• the second switching element is thermally connected to the housing via the thermal conductive member and the thermal connecting member,
• wherein when a direction in which the housing and the first surface of the wiring board face each other is defined as a first direction,
• the housing is provided with a protruding portion disposed at a portion overlapping the second switching element as viewed from the first direction and that protrudes toward the wiring board, and
• a size in the first direction of a portion of the thermal connecting member provided between the first switching element and the housing is larger than a size in the first direction of a portion of the thermal connecting member that overlaps the second switching element, as viewed from the first direction.