Abstract: The present invention provides an exhaust gas pressure control valve which allows discharge of exhaust gases from entire cross-sectional area of the exhaust gas pipeline when the exhaust gas pressure control valve completely. An exhaust gas pressure control valve is mounted on a gas pipeline having a first cross-section where exhaust gas from engine communicates and disposed upstream or downstream of a muffler. The exhaust gas pressure control valve comprises: a housing having a first cross-sectional surface and a second cross-sectional surface larger than the first surface and connected to the gas pipelines for communicating the exhaust gas; the valve axis supported along the second cross-section not overlapping with the first cross-section when viewed from the flowing direction, the valve axis supported by the housing in a crossing direction to the flowing direction; and a valve element connected to the valve axis and adjusts flow of the exhaust gas communicating to the gas pipeline.