A method for manufacturing a photochromic lens using a photochromic lens manufacturing device , the method comprising: - inputting surface treatment data to a data storage unit , the surface treatment data including: optical surface data related to optical surfaces of a lens to be manufactured, lens substrate data related to lens substrate material, and photochromic data at least related to a photochromic film; - forming a hard film and a photochromic film on a lens substrate using a surface treatment unit including a photochromic film forming means and a hard film forming means, wherein the hard film forming means forms a hard film, and the photochromic film forming means forms, based on the photochromic data, a photochromic film on a lens substrate , the lens substrate being selected based on the optical surface data and the lens substrate data, the lens substrate having an optical surface formed on at least the convex-side thereof; and - setting a film forming condition of the photochromic film and of the hard film using a control unit including a first film forming control device and a second film forming control device , wherein the first film forming control device is setting a film forming condition of the photochromic film based on the optical surface data, the lens substrate data and the photochromic data, and the second film forming control device is setting a film forming condition of the hard film based on the lens substrate data, wherein at least either of color and density is included in the photochromic data, and wherein, as the film forming condition of the photochromic film, the first film forming control device selects at least either of the type of the photochromic liquid corresponding to the color of the photochromic film and the thickness of the coated film corresponding to the density of the photochromic film, and outputs the selected data to the photochromic film forming means. - inputting surface treatment data to a data storage unit , the surface treatment data including: optical surface data related to optical surfaces of a lens to be manufactured, lens substrate data related to lens substrate material, and photochromic data at least related to a photochromic film; - forming a hard film and a photochromic film on a lens substrate using a surface treatment unit including a photochromic film forming means and a hard film forming means, wherein the hard film forming means forms a hard film, and the photochromic film forming means forms, based on the photochromic data, a photochromic film on a lens substrate , the lens substrate being selected based on the optical surface data and the lens substrate data, the lens substrate having an optical surface formed on at least the convex-side thereof; and - setting a film forming condition of the photochromic film and of the hard film using a control unit including a first film forming control device and a second film forming control device , wherein the first film forming control device is setting a film forming condition of the photochromic film based on the optical surface data, the lens substrate data and the photochromic data, and the second film forming control device is setting a film forming condition of the hard film based on the lens substrate data, wherein at least either of color and density is included in the photochromic data, and wherein, as the film forming condition of the photochromic film, the first film forming control device selects at least either of the type of the photochromic liquid corresponding to the color of the photochromic film and the thickness of the coated film corresponding to the density of the photochromic film, and outputs the selected data to the photochromic film forming means. <EOS>