In particular, the first channel portions 61 of the present embodiment each include the first bent portion 61c on the second channel portion 62 side at a location between the first outlet 71 and the portion connected to the second channel portion 62. Accordingly, water flowing from the first outlet 71 side toward the second outlet 72 side passes through the first bent portion 61c, thus moving away from the second channel portion 62 (boundary between the first channel portion 61 and the second channel portion 62). From another viewpoint, water that enters from the first portion 611 of the first channel portion 61 into the second portion 612 through the first bent portion 61c flows less on the second channel portion 62 side of the second portion 612, and flows more on the opposite side. In other words, by providing this first bent portion 61c, it is possible to further improve the effect of preventing water from entering the second channel portion 62.