CHECK VALVE FOR BREAST MILK PUMP

PROBLEM TO BE SOLVED: To provide a check valve for breast milk pump causing no damage and having superior responsiveness to a pressure change.SOLUTION: The check valve to be attached between a breast milk container and negative pressure generation means of the breast milk pump comprises an elastic material. The check valve includes thin-wall, inclined side walls facing each other at a lower end side of a hollow cylindrical trunk part. The inclined side walls are formed into V-shaped cross section in side view such that an interval therebetween becomes gradually closer as heading for the lower end. At both sides of the linear lower end part where the inclined side walls are mutually drawn close, thick-wall lip parts are formed in the length direction respectively as means for forming an opening part. The following means are also adopted: the respective thick-wall lip parts have half-split columnar shape protruding outward, and the opening part of the lips is constantly opened in an unloaded state. The check valve is formed of silicone rubber, elastomer, or the like.