A pressure switch (11, 40, 50, 60) comprising: a case (12, 51, 61) provided with a cylinder hole which communicates with a flow path to which a fluid is supplied; a piston movably accommodated in the cylinder hole, the piston forming a pressure chamber in the cylinder hole and moving back in response to the fluid flowing from the flow path into the pressure chamber; a magnetic sensor (27, 62) mounted on the case and adapted to detect, according to a position of a permanent magnet provided to the piston, whether or not the piston is in a pressure detection position; a pressing member (25, 41) facing the piston and accomodated in the case (12, 51, 61) so as to be movable in a sliding direction of the piston, the pressing member being adapted to set, on the basis of a pressing force applied to the piston by an elastic member mounted between the pressing member and the piston, a pressure of the fluid in the pressure chamber so that the piston takes the pressure detection position; and a display portion (25a, 41 a) provided to the pressing member and adapted to display outwardly the set pressure via a window portion provided to a pressure display wall of the case, characterized in that the pressure switch further comprises: an adjusting member (33, 42) including a driving-side inclined surface (33a, 42a) in sliding contact with a driven-side inclined surface (25c, 41d) formed on the pressing member (25, 41), and the adjusting member is disposed so as to be movable in a direction orthogonal to the sliding direction of the piston; and an operating member provided to the pressure display wall, the operating member moving the adjusting member to set the pressing force corresponding to a state where the piston takes the pressure detection position, wherein the operating member is provided to the pressure display wall provided with the window portion. a case (12, 51, 61) provided with a cylinder hole which communicates with a flow path to which a fluid is supplied; a piston movably accommodated in the cylinder hole, the piston forming a pressure chamber in the cylinder hole and moving back in response to the fluid flowing from the flow path into the pressure chamber; a magnetic sensor (27, 62) mounted on the case and adapted to detect, according to a position of a permanent magnet provided to the piston, whether or not the piston is in a pressure detection position; a pressing member (25, 41) facing the piston and accomodated in the case (12, 51, 61) so as to be movable in a sliding direction of the piston, the pressing member being adapted to set, on the basis of a pressing force applied to the piston by an elastic member mounted between the pressing member and the piston, a pressure of the fluid in the pressure chamber so that the piston takes the pressure detection position; and a display portion (25a, 41 a) provided to the pressing member and adapted to display outwardly the set pressure via a window portion provided to a pressure display wall of the case, characterized in that the pressure switch further comprises: an adjusting member (33, 42) including a driving-side inclined surface (33a, 42a) in sliding contact with a driven-side inclined surface (25c, 41d) formed on the pressing member (25, 41), and the adjusting member is disposed so as to be movable in a direction orthogonal to the sliding direction of the piston; and an operating member provided to the pressure display wall, the operating member moving the adjusting member to set the pressing force corresponding to a state where the piston takes the pressure detection position, wherein the operating member is provided to the pressure display wall provided with the window portion. an adjusting member (33, 42) including a driving-side inclined surface (33a, 42a) in sliding contact with a driven-side inclined surface (25c, 41d) formed on the pressing member (25, 41), and the adjusting member is disposed so as to be movable in a direction orthogonal to the sliding direction of the piston; and an operating member provided to the pressure display wall, the operating member moving the adjusting member to set the pressing force corresponding to a state where the piston takes the pressure detection position, wherein the operating member is provided to the pressure display wall provided with the window portion.