Electric valve and refrigeration cycle system

The invention provides an electric valve and a refrigeration cycle system. In an electric valve having a two-stage flow rate control region in which a main valve body is seated on a main valve seat and flow control is performed in a small flow rate control region of a refrigerant by a throttle formed between a sub valve port of the main valve body and a needle valve, even if there is vibration of the main valve body in the small flow control region, the controllability of a small flow rate control area is also improved. A cylindrical linear part (3S) parallel to the axis (L) is formed at the end of the main valve part (31) of the main valve body (3). In the main valve body (3), a main valve port (13a) is in a fully closed state, and a fluid flows through a gap between a needle part (42) of the needle valve (4) and a throttle part of a sub valve port (33a) to form a small flow control region. In a small flow control region, the cross-sectional area of the gap between the straight part (3S) of the main valve bo