A pressure gauge comprising an indicator needle to be rotated by an angle corresponding to pressure of fluid, and a scale plate marked with a pressure scale which is indicated by the indicator needle along a rotation path of the indicator needle, the pressure gauge comprising: a pressure gauge main body including the scale plate and the indicator needle, and being provided with a pressure measuring device configured to rotate the indicator needle corresponding to the pressure of fluid; characterized in that the pressure gauge further comprises: a front wall formed with a circular guide hole, a first ring-shaped concave portion larger in inner diameter than the guide hole, and a second ring-shaped concave portion larger in diameter than the first ring-shaped concave portion, the front wall being attached to the pressure gauge main body, the scale plate being exposed to the outside through the circular guide hole; an arc-shaped preset pressure indicating member extending along the pressure scale in a circular arc pattern, and being provided with a first display section at one end thereof, the preset pressure indicating member being slidably attached to the first ring-shaped concave portion along the guide hole; a transparent cover rotatably attached to the second ring-shaped concave portion, and configured to cover the preset pressure indicating member and the scale plate; an opaque shield portion extending along the pressure scale in a circular arc pattern, and being provided on the transparent cover, and provided with a second display section at one end thereof; and a driving pawl portion (27a, 27b) provided on the transparent cover, and configured to come into contact with a driven pawl portion provided on the preset pressure indicating member to have the preset pressure indicating member perform a following rotation, wherein a ring-shaped guide groove opens on a rear surface of the transparent cover, and the preset pressure indicating member is mounted and slidably movable in the guide groove, the preset pressure indicating member has an area between the first display section and the second display section, the area being not covered by the shield portion, the area being displayed to the outside through the transparent cover. a pressure gauge main body including the scale plate and the indicator needle, and being provided with a pressure measuring device configured to rotate the indicator needle corresponding to the pressure of fluid; a front wall formed with a circular guide hole, a first ring-shaped concave portion larger in inner diameter than the guide hole, and a second ring-shaped concave portion larger in diameter than the first ring-shaped concave portion, the front wall being attached to the pressure gauge main body, the scale plate being exposed to the outside through the circular guide hole; an arc-shaped preset pressure indicating member extending along the pressure scale in a circular arc pattern, and being provided with a first display section at one end thereof, the preset pressure indicating member being slidably attached to the first ring-shaped concave portion along the guide hole; a transparent cover rotatably attached to the second ring-shaped concave portion, and configured to cover the preset pressure indicating member and the scale plate; an opaque shield portion extending along the pressure scale in a circular arc pattern, and being provided on the transparent cover, and provided with a second display section at one end thereof; and a driving pawl portion (27a, 27b) provided on the transparent cover, and configured to come into contact with a driven pawl portion provided on the preset pressure indicating member to have the preset pressure indicating member perform a following rotation, wherein a ring-shaped guide groove opens on a rear surface of the transparent cover, and the preset pressure indicating member is mounted and slidably movable in the guide groove, the preset pressure indicating member has an area between the first display section and the second display section, the area being not covered by the shield portion, the area being displayed to the outside through the transparent cover.