Surface treatment device

A surface treatment device for applying surface treatment at an inner wall surface of a bottomed hole, by utilizing an electrode device to be inserted thereto, the electrode device comprising:

• a hollow bottomed large-diameter electrode pipe that is configured to insert into a space inside the bottomed hole;
• and
• a solid small-diameter electrode rod that is inserted into a space inside the hollow bottomed large-diameter electrode pipe so that a front-end side thereof extends to a bottom part of the hollow bottomed large-diameter electrode pipe so as to couple therewith;
• a solution flow channel formed between an inside surface of the bottomed hole and an outer surface of the hollow bottomed large-diameter electrode pipe, so that an electrolytic treatment solution flows therethrough;
• an external power supply connected across the electrode device and the inner wall surface of the bottomed hole;
• a front-end member provided at a front-end portion of the hollow bottomed large-diameter electrode pipe, having a hemispherical configuration so as to close the front-end portion thereof facing the inner wall surface of the bottomed hole;
• and
• at least one through hole channel defined in the front-end member linking an inside and an outside of the hollow bottomed large-diameter electrode pipe.