High pressure fuel supply device having plating layer and manufacturing method thereof

In a pressure accumulator vessel (10) of a high pressure fuel supply device (1), a chamfered section (15) is formed in a connection between an accumulation chamber (13) and a corresponding fuel passage (14). An inner plated part (41), which includes a plating layer, is formed along a wall surface of the accumulation chamber (13), a wall surface of the fuel passage (14) and a wall surface of the chamfered section (15). The pressure accumulator vessel (10) further includes connecting portions (31) and sealing portions (32). The connecting portion (31) is formed to join with a fuel pipe (2). The sealing portion (32) is formed adjacent to the connecting portion (31) to fluid-tightly engage with the fuel pipe (2). Each unplated part (42) is formed along a wall surface of the corresponding connecting portion (31) and a wall surface of the corresponding sealing portion (32).