Shaft seal structure for valve

A seal member (10) has a structure whereby a carbon material is packed into a framework of a stainless steel mesh material. The sealing member is formed with: an annular flange part (11) that engages a recess formed with a stepped part (7) formed along the inner wall surface of a through-hole (4) and with a press-fitted plate (8); a tubular part (12) that protrudes from the flange part (11) so as to taper in the direction of a fluid passage (3); and a sliding part (13) that makes contact with the outer circumferential surface of a valve shaft (6) at the inner circumferential surface side of tip of the tubular part (12).