SUBSTRATE FOR POWER MODULE, SUBSTRATE FOR POWER MODULE WITH HEAT SINK, POWER MODULE, AND METHOD F

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A power module substrate (10) includes an insulating substrate (11), and a circuit layer (12) that is formed on one surface of the insulating substrate (11). The circuit layer (12) is formed by bonding a first copper plate (22) onto one surface of the insulating substrate (11). Prior to bonding, the first copper plate (22) has a composition containing at least either a total of 1 to 100 mol ppm of one or more kinds among an alkaline-earth element, a transition metal element, and a rare-earth element, or 100 to 1000 mol ppm of boron, the remainder being copper and unavoidable impurities.