<p>An orifice (60) formed in a valve seat (12) has: an orifice inlet portion (61) where the hole diameter is smallest; an orifice intermediate portion (62) where the hole diameter increases in the refrigerant flow out direction from the orifice inlet portion (61) such that a first taper angle is formed; and an orifice outlet portion (63) where the hole diameter does not change or increases in the refrigerant flow out direction from the orifice intermediate portion (62) such that a second taper angle smaller than the first taper angle is formed.</p>
