Power conditioner device and module substrate structure using the same

This invention enhances the maintenance when the individual electronic component fails and realizes low cost maintenance. When raising the DC power supplied from a solar cell or a fuel cell by means of a DC/DC converter circuit (30) and converting to the AC power by means of an inverter circuit (40), an electronic circuit such as the DC/DC converter circuit (30) and the inverter circuit (40) or a CPU for controlling the operation of the circuits are accommodated in a case body to supply the AC power to a general load, the DC/DC converter circuit (30) and the inverter circuit (40) are mounted on a DC/DC converter circuit mounting substrate (31) and an inverter circuit mounting substrate (41), which are configured as separate bodies, for modularization.