An inverter device includes a converter circuit unit, an inverter circuit unit, and a current detector. The inverter device includes a calculator that calculates a frequency command value based on output current detected by the current detector, and a pulse signal output unit that outputs a pulse signal based on the frequency command value calculated by the calculator. The calculator includes a calculator and a calculator. The calculator estimates a target frequency from a load torque and motor characteristics, and calculates a first frequency command value with the estimated target frequency as a target. The calculator calculates a second frequency command value to cause torque current detected based on the output current detected by the current detector to follow a torque current limit value calculated based on the output current. When a deviation of the first frequency command value from the target frequency becomes less than or equal to a determination value, output to the pulse signal output unit is switched from the first frequency command value to the second frequency command value.