Integrated power converter apparatus and dc-dc converter apparatus to be used therein

The objective of the present invention is to reduce the size of an integrated power converter apparatus in which a plurality of power converter apparatuses have been integrated, and of a DC-DC converter apparatus to be used therein. An integrated power converter apparatus according to the present invention has a first power converter apparatus and a second power converter apparatus connected together. The first power converter apparatus is provided with a first power semiconductor module that converts power, a flow-path forming section that forms a flow path through which a coolant flows, a first case that houses the first power semiconductor module and the flow-path forming section, an entrance piping connected to the flow path, and an exit piping connected to the flow path. The second power converter apparatus is provided with a second power semiconductor module that converts power, and a second case that houses the second power semiconductor module. The flow-path forming section comprises an opening section connected to the flow path, and the second case is anchored to the flow-path forming section or the first case such that a portion of the second case closes the opening section.