The inverter device

PROBLEM TO BE SOLVED: To provide an inverter device capable of reducing heat concentration due to heat generation of a switch element with simple configurations.SOLUTION: An inverter device including a 3-level circuit which has a plurality of pre-stage switch elements S1-S8 connected in series and allows a DC voltage to have potentials of three or more levels through switching of the plurality of pre-stage switch elements S1-S8 respectively, includes: a circuit board 200 on which the plurality of pre-stage switch elements S1-S8 are mounted; and a heat sink 300 which is mounted on the circuit board 200 and radiates heat generated by the pre-stage switch elements S1-S8. Some switch elements (pre-stage switch elements S1, S2, S7, and S8) having high heating value during driving of the 3-level circuit among the plurality of pre-stage switch elements S1-S8 are closely arranged. The heat sink 300 is configured such that a plurality of projection parts 302 are arranged nearby the pre-stage switch elements S1, S2, S7, and S8 which are closely arranged so as to make the heat radiation thereof higher than the heat radiation of the other pre-stage switch elements S3-S6.