To improve adhesion to a base material.

This coating film is made to the structure that molecules 2 containing a fluorine-carbon chain are contained in a coating film 3 consisting essentially of silicon oxide and the density distribution is increased from the surface of a glass base material 1 toward the outermost surface of the coating film. As the producing method, (1) a solution in which TEOS(tetraethoxysilane), water and an acidic catalyst are dissolved, is applied on the surface of the glass base material, (2) a solution in which the TEOS, FMOS (fluoroalkyltrimethoxysilane), water and the acidic catalyst are dissolved, is applied further and (3) the glass base material is dipped into an aq. solution having ≤pH 6 and there after, is fired.