1. A waterproof click pad device comprising: a click pad; a frame surrounding said click pad and surrounding an axis passing through said click pad; and a waterproof unit transverse to said axis and in sheet form, said waterproof unit including a frame adhesive member that surrounds the axis and that is adhered to said frame, a first non-adhesive member that surrounds the axis, that is connected to an inner periphery of said frame adhesive member and that is spaced apart from and located above said frame, a second non-adhesive member that surrounds the axis, that is connected to an inner periphery of said first non-adhesive member and that is spaced apart from and located above said click pad and said frame, and an plate adhesive member that is connected to an inner periphery of said second non-adhesive member and that is adhered to said click pad, wherein said second non-adhesive member has a buffer portion tapering in thickness, wherein said second non-adhesive member further has a connecting portion connected to said plate adhesive member and said buffer portion and having a thickness smaller than that of said first non-adhesive member, wherein said buffer portion has a first segment connected to said first non-adhesive member, and a second segment connected between said first segment and said connecting portion, said second segment cooperating with said first segment and said connecting portion define an annular groove that surrounds said connecting portion, a thickness of a portion of said second segment adjacent to said first segment is greater than that of another portion of said second segment adjacent to said connecting portion.