Disclosed herein is a canister close valve device for opening or closing a passage of a canister collecting evaporation gas evaporated in a fuel tank and a passage communicating with the atmosphere. The canister close valve device includes a housing which has a first vapor line making the fuel tank communicate with a canister, a second vapor line making the atmosphere communicate with the canister, and a coupling part coupling the first vapor line to the second vapor line. Further, the device includes a first diaphragm valve assembly opening or closing the first vapor line, a second diaphragm valve assembly opening or closing the second vapor line, and a solenoid valve mounted to the coupling part and including a magnetic body which is coaxially and slidably connected to the first and second diaphragm valve assemblies to move the first and second diaphragm valve assemblies.