Exhaust pressure control valve

An exhaust pressure control valve (1) is provided with a relief valve chamber (20) having a relief body (21) integrally formed with a valve body (11). The relief valve chamber (20) is arranged in an orthogonal direction to a main passage of an exhaust gas, and a seat member (22) made of a stainless steel material or the like and having a relief valve seat (22a) is attached to the relief valve chamber in a side of the valve body (11). Further, within the relief valve chamber (20), there are arranged a relief valve body sliding guide (24) arranged by press fitting, a relief valve body (23) arranged so as to freely slide within the relief valve body sliding guide (24), a relief spring (25) energizing the relief valve body (23) to a side of the seat member (22), and a plug (26). Further, each of the elements arranged within the relief valve chamber (20) is inserted from an upper opening portion of the relief valve chamber (20) in one direction.