A valve-integrating container, comprising: a container body formed in a cylindrical shape extending in an axial direction, the container body having an enlarged-diameter portion, a reduced-diameter portion provided below the enlarged-diameter portion, and a connecting portion connecting the enlarged-diameter portion and the reduced-diameter portion, and a valve mechanism mounted to the reduced-diameter portion of the container body and configured to switch whether a liquid stored in the container body is allowed to flow out through a first opening portion provided at a lower end of the reduced-diameter portion, the valve mechanism including: a spring disposed along the axial direction; a spring supporting part supporting one end portion of the spring; and a valve plug disposed between the spring supporting part and the first opening portion and receiving a biasing force toward the first opening portion from another end portion of the spring, the spring supporting part including: a liquid flow channel formed in a cylindrical shape extending along the axial direction; a lower end portion mounted to an inner circumferential surface of the reduced-diameter portion; an upper end portion projecting toward the enlarged-diameter portion; and a first guide groove formed on an outer circumferential surface thereof for guiding a liquid stored in the connecting portion downwardly in the axial direction, wherein the valve plug has a second guide groove formed on an outer circumferential surface thereof for guiding the liquid guided by the first guide groove, downwardly in the axial direction to the first opening portion, characterized in that the valve plug contacts the opening portion of the reduced-diameter portion of the container body when receiving the biasing force toward the first opening portion from the other end portion of the spring. a container body formed in a cylindrical shape extending in an axial direction, the container body having an enlarged-diameter portion, a reduced-diameter portion provided below the enlarged-diameter portion, and a connecting portion connecting the enlarged-diameter portion and the reduced-diameter portion, and a valve mechanism mounted to the reduced-diameter portion of the container body and configured to switch whether a liquid stored in the container body is allowed to flow out through a first opening portion provided at a lower end of the reduced-diameter portion, the valve mechanism including: a spring disposed along the axial direction; a spring supporting part supporting one end portion of the spring; and a valve plug disposed between the spring supporting part and the first opening portion and receiving a biasing force toward the first opening portion from another end portion of the spring, the spring supporting part including: a liquid flow channel formed in a cylindrical shape extending along the axial direction; a lower end portion mounted to an inner circumferential surface of the reduced-diameter portion; an upper end portion projecting toward the enlarged-diameter portion; and a first guide groove formed on an outer circumferential surface thereof for guiding a liquid stored in the connecting portion downwardly in the axial direction, wherein a spring disposed along the axial direction; a spring supporting part supporting one end portion of the spring; and a valve plug disposed between the spring supporting part and the first opening portion and receiving a biasing force toward the first opening portion from another end portion of the spring, a liquid flow channel formed in a cylindrical shape extending along the axial direction; a lower end portion mounted to an inner circumferential surface of the reduced-diameter portion; an upper end portion projecting toward the enlarged-diameter portion; and a first guide groove formed on an outer circumferential surface thereof for guiding a liquid stored in the connecting portion downwardly in the axial direction, wherein