Vehicle-mounted electric compressor

A vehicle-mounted electric compressor comprising:

• a compressor body that includes a motor compressing a refrigerant;
• and
• an inverter that includes a power element supplying an electric current to the motor,
• wherein the power element includes
• a metal substrate that includes electrically conductive layers provided on a partial region of a surface of the metal substrate,
• a heat-generating element that includes a metal layer soldered onto each of the electrically conductive layers, and
• a resin substrate that is disposed such that the resin substrate and the metal substrate are arranged in a plate thickness direction of the metal substrate and that has a metal pattern printed on a surface of the resin substrate and an electronic component mounted on the metal pattern, and
• the electronic component and a terminal of the heat-generating element are connected to each other via the metal pattern,
• each of the electrically conductive layer overlaps to the metal layer in a plane orthogonal to the plate thickness direction and has the same shape as the layer as seen in a plan view, and
• a gap between adjacent electrically conductive layers is same as the creepage distance.