NOVELTY - The power converter device (1) has a pressing member (4) arranged between laminated body (3) and the inner surface (201) of a frame (2) at compression state by which an elastic body (42) e.g. plate spring is compressed into the lamination direction. The pressing member has an engaging portion (412) and to-be-engaged portion (401) provided so that a press plate (40) and a support plate (41) are mutually engaged and elastic body maintains compressed state that is larger than the compression state.    USE - Power converter device for converting direct current power from battery into alternating current power to drive motor of e.g. electric vehicle, hybrid vehicle.    ADVANTAGE - Ensures semiconductor module and cooling pipe are stuck in the frame by pressing the laminated body in lamination direction. The pressing member is arranged easily and operability of arrangement process is improved since pressing member is arranged between the laminated body and inner surface of the frame. Reduces size of the power converter device easily by eliminating need to provide space for press holding jig in the frame since large press holding jig for compressing the pressing member is unnecessary. Simplifies manufacture of pressing member and reduces size of the power converter device due to simple structure of the engagement unit. The assembly of pressing member is performed more easily since release jig for releasing engagement of the engaging portion and to-be-engaged portion is inserted from the opening of frame. The workability of arrangement process and release process is improved since engagement state of engagement unit is released in the state in which laminated body and pressing member are arranged at the predetermined position. Improves cooling efficiency of the semiconductor module since semiconductor module and cooling pipe are fully stuck due to enough restoring force of the elastic body.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a manufacturing method of the power converter device.    DESCRIPTION OF DRAWING(S) - The drawing shows a top view of a power converter device.    Power converter device (1)    Frame (2)    Laminated body (3)    Pressing member (4)    Press plate (40)    Support plate (41)    Elastic body (42)    Inner surface (201)    To-be-engaged portion (401)    Engaging portion (412)