To maintain sureness by providing a pressure adjusting knob for operating a pressure adjusting valve for a valve casing of the normal direction of a remainder meter to manipulate the knob while confirming the remainder meter from a front side.

High pressure gas introduced to a main path 13 from an intake 2 is reduced to proper pressure by a pressure reducing valve main body 4 and introduced to a branching path 14. Then, after being adjusted to proper pressure by pressure adjusting knobs 5, pressure gas is discharged from an outlet. These knobs 5 are provided on the front surface of a valve casing to be respectively symmetrical. Namely after reducing pressure by the main body 4 once, necessary second pressure reduction is additionally executed by the knobs 5 to obtain optimum gas pressure. In this case, a pipe route is obtained by providing a straight pipe 15 by respectively boring from both right/left sides of the casing 1 and continuing with the pipe 15 by foring an oblique pipe 16 from the side of the housing part of the reducing valve main body before mounting the main body 4 to the pipe 15.