The present invention includes a storing section 102a that stores a chemical, an opening provided in an upper surface 102u of the storing section 102a, a concave portion 103 formed in a side face 102as, and a convex portion 110 formed in the side face 102as. A face 110s on the bottom surface side of the convex portion 110 is formed to incline to the upper surface 102u side towards a top portion 110c of the convex portion 110, and the convex portion 110 and the concave portion 103 are positioned on the side face 102as so as to deviate from central axes C1, C2 to a side of another side face 102ar contiguous with the side face 102as.
