To provide an electronic component unit capable of adjusting quantity of heat transmitted from an electronic component to a thermal fuse and capable of using a variety of temperature fuses.

The electronic component unit includes a power capacitor (electronic component) 3 which generates heat by turning on electric current, a thermal fuse 4 which is blown out and cuts off current when an abnormal heat generation occurs to the power capacitor 3, and a spring plate (fixing member) 10 which fixes the thermal fuse 4 to the vicinity of the power capacitor 3 and transmits heat from the power capacitor 3 to the thermal fuse 4. The spring plate 10 has a heat receiving portion A in which the amount of receiving heat received from the power capacitor 3 exceeds the amount of radiating heat from itself and a heat radiating portion B in which the amount of radiating heat exceeds the amount of receiving heat.