A pilot valve comprising: a bottomed cylinder-shaped valve body having an opening at one end thereof; a spool slidably accommodated in the valve body; and a resilient member disposed at an other end of the spool opposite to the opening side of the valve body to urge the spool toward the opening side of the valve body; the valve body having at least three through-hole portions substantially equally spaced in a longitudinal direction of the valve body; the spool allowing communication between at least two mutually adjacent through-hole portions of the valve body; wherein the resilient member is configured to press the spool toward the opening side of the valve body in cooperation with a pressing device, thereby switching the spool from a state where the spool is positioned at a side of the valve body opposite to the opening side to a state where the spool is positioned at the opening side, wherein the spool includes a hollow first spool slidably accommodated in the valve body, and a second spool slidably accommodated in the first spool; the resilient member comprising: a first resilient member disposed at an other end of the first spool opposite to the opening side of the valve body to urge the first spool toward the opening side; and a second resilient member disposed at an other end of the second spool opposite to the opening side of the valve body to urge the second spool toward the opening side, the second spool having a communicating portion that is configured to allow communication between at least two mutually adjacent through-hole portions of the three through-hole portions of the first spool, characterized in that the second resilient member is disposed to urge the second spool toward the opening side with a resilient force less than that of the first resilient member, the first spool having at least three through-hole portions that are respectively aligned with the three through-hole portions of the valve body when the first spool is positioned at the opening side of the valve body. a bottomed cylinder-shaped valve body having an opening at one end thereof; a spool slidably accommodated in the valve body; and a resilient member disposed at an other end of the spool opposite to the opening side of the valve body to urge the spool toward the opening side of the valve body; the valve body having at least three through-hole portions substantially equally spaced in a longitudinal direction of the valve body; the spool allowing communication between at least two mutually adjacent through-hole portions of the valve body; wherein the resilient member is configured to press the spool toward the opening side of the valve body in cooperation with a pressing device, thereby switching the spool from a state where the spool is positioned at a side of the valve body opposite to the opening side to a state where the spool is positioned at the opening side, wherein the spool includes a hollow first spool slidably accommodated in the valve body, and a second spool slidably accommodated in the first spool; the resilient member comprising: a first resilient member disposed at an other end of the first spool opposite to the opening side of the valve body to urge the first spool toward the opening side; and a second resilient member disposed at an other end of the second spool opposite to the opening side of the valve body to urge the second spool toward the opening side, the second spool having a communicating portion that is configured to allow communication between at least two mutually adjacent through-hole portions of the three through-hole portions of the first spool, characterized in that the second resilient member is disposed to urge the second spool toward the opening side with a resilient force less than that of the first resilient member, the first spool having at least three through-hole portions that are respectively aligned with the three through-hole portions of the valve body when the first spool is positioned at the opening side of the valve body. a first resilient member disposed at an other end of the first spool opposite to the opening side of the valve body to urge the first spool toward the opening side; and a second resilient member disposed at an other end of the second spool opposite to the opening side of the valve body to urge the second spool toward the opening side, the second spool having a communicating portion that is configured to allow communication between at least two mutually adjacent through-hole portions of the three through-hole portions of the first spool, characterized in that the second resilient member is disposed to urge the second spool toward the opening side with a resilient force less than that of the first resilient member, the first spool having at least three through-hole portions that are respectively aligned with the three through-hole portions of the valve body when the first spool is positioned at the opening side of the valve body.