A trigger sprayer for, in a state of being attached to a container, causing liquid inside the container to be sprayed from a nozzle part and through a passage by rotating a trigger part to move a piston part to apply pressure to liquid inside a cylinder portion of a cylinder structure comprised in the trigger sprayer, the trigger sprayer comprising: a second valve provided in the passage between the cylinder portion and the container; and a first valve provided in the passage between the cylinder portion and the nozzle part, wherein the first valve includes a first valve body and a first valve seat, the first valve body is elastically pressed against the first valve seat, when the first valve body moves away from the first valve seat so that the first valve opens, the first valve body moves in the same direction as the direction that the liquid flows, the first valve body of the first valve has a passage hole extending in a central axial direction, the liquid flows through the passage hole in a case where the first valve is open, the first valve body includes a small-diameter cylindrical part and a large-diameter cylindrical part coupled to an outer side of the small-diameter cylindrical part via a connecting part, the small-diameter cylindrical part has a gradually-expanded thin-walled increasing diameter portion formed at a tip thereof, the large-diameter cylindrical part has two flange portions, the cylinder structure is provided with a columnar hole inside which a standing cylindrical portion of an attachment base part that is attachable to the container via a cap is attached, and the first valve seat is formed at an upper end of the attachment base part, wherein a hanging cylindrical portion is formed at an upper end of the columnar hole of the cylinder structure in a hanging manner, the increasing diameter portion of the first valve body of the first valve is in sliding contact with an inner circumference of this hanging cylindrical portion, the flange portions of the first valve body of the first valve are in sliding contact with an inner circumferential surface of the standing cylindrical portion of the attachment base part, and a coil spring that elastically presses the first valve body downward is fitted on a circumference of the hanging cylindrical portion. a second valve provided in the passage between the cylinder portion and the container; and a first valve provided in the passage between the cylinder portion and the nozzle part, wherein the first valve includes a first valve body and a first valve seat, the first valve body is elastically pressed against the first valve seat, when the first valve body moves away from the first valve seat so that the first valve opens, the first valve body moves in the same direction as the direction that the liquid flows, the first valve body of the first valve has a passage hole extending in a central axial direction, the liquid flows through the passage hole in a case where the first valve is open, the first valve body includes a small-diameter cylindrical part and a large-diameter cylindrical part coupled to an outer side of the small-diameter cylindrical part via a connecting part, the small-diameter cylindrical part has a gradually-expanded thin-walled increasing diameter portion formed at a tip thereof, the large-diameter cylindrical part has two flange portions, the cylinder structure is provided with a columnar hole inside which a standing cylindrical portion of an attachment base part that is attachable to the container via a cap is attached, and the first valve seat is formed at an upper end of the attachment base part, wherein a hanging cylindrical portion is formed at an upper end of the columnar hole of the cylinder structure in a hanging manner, the increasing diameter portion of the first valve body of the first valve is in sliding contact with an inner circumference of this hanging cylindrical portion, the flange portions of the first valve body of the first valve are in sliding contact with an inner circumferential surface of the standing cylindrical portion of the attachment base part, and a coil spring that elastically presses the first valve body downward is fitted on a circumference of the hanging cylindrical portion.