An air conditioner comprising an indoor unit and an outdoor unit, wherein the outdoor unit includes: a motor; a motor driving element connected to the motor, which drives the motor; a DC/DC converter connected to the motor driving element, which converts a voltage obtained using a diode bridge configured to rectify an AC current supplied from an alternating current power supply that is a power supply of the outdoor unit and using an electrolytic capacitor in which electric charges outputted from the diode bridge are accumulated, and supplies a converted voltage to the motor driving element; a first relay including a first coil part and a first contact part provided between the alternating current power supply and the converter, in which the first contact part is placed in an electrically-disconnected state when any current does not flow through the first coil part and the first contact part is placed in an electrically-connected state when a current flows through the first coil part; a PTC (Positive Temperature Coefficient) thermistor connected in parallel to the first contact part; and a temperature protector provided on a supply line of a relay-driving power supply that is a power supply of the first relay, which is in an electrically-connected state when a temperature of the motor is lower than a predetermined temperature, and is placed in an electrically-disconnected state when the temperature of the motor reaches the predetermined temperature or higher, wherein the AC current supplied from the alternating current power supply is not directly supplied to the outdoor unit, but is supplied thereto through the indoor unit, and the indoor unit includes a second relay that includes a second coil part and a second contact part provided on the supply line of the alternating current power supply. a motor; a motor driving element connected to the motor, which drives the motor; a DC/DC converter connected to the motor driving element, which converts a voltage obtained using a diode bridge configured to rectify an AC current supplied from an alternating current power supply that is a power supply of the outdoor unit and using an electrolytic capacitor in which electric charges outputted from the diode bridge are accumulated, and supplies a converted voltage to the motor driving element; a first relay including a first coil part and a first contact part provided between the alternating current power supply and the converter, in which the first contact part is placed in an electrically-disconnected state when any current does not flow through the first coil part and the first contact part is placed in an electrically-connected state when a current flows through the first coil part; a PTC (Positive Temperature Coefficient) thermistor connected in parallel to the first contact part; and a temperature protector provided on a supply line of a relay-driving power supply that is a power supply of the first relay, which is in an electrically-connected state when a temperature of the motor is lower than a predetermined temperature, and is placed in an electrically-disconnected state when the temperature of the motor reaches the predetermined temperature or higher, wherein the AC current supplied from the alternating current power supply is not directly supplied to the outdoor unit, but is supplied thereto through the indoor unit, and the indoor unit includes a second relay that includes a second coil part and a second contact part provided on the supply line of the alternating current power supply.