A process for producing a film forming composition, the process comprising hydrolyzing and condensing: at least one silane compound selected from a compound (A-1) shown by the following general formula, a compound (A-2) shown by the following general formula, and a compound (A-3) shown by the following general formula, R a Si(OR 1) 4-a wherein R represents a hydrogen atom, a fluorine atom, or a monovalent organic group, R 1 represents a monovalent organic group, and a represents 1 or 2; Si(OR 2) 4 wherein R 2 represents a monovalent organic group; R 3 b (R 4 O) 3-b Si-(R 7) d -Si(OR 5) 3-c R 6 c wherein R 3, R 4, R 5, and R 6 individually represent a monovalent organic group, b and c individually represent an integer of 0 to 2, R 7 represents an oxygen atom, a phenylene group, or a group -(CH 2) m -, wherein m represents an integer of 1 to 6, and d represents 0 or 1; and a cyclic silane compound shown by the following general formula, or being 1,3,5,7-tetravinyl-1,3,5,7-tetramethylcyclotetrasiloxane, 1,3,5-trivinylcyclotrisiloxane, 1,3,5,7-tetravinylcyclotetrasiloxane, 1,3,5,7,9-pentavinylcyclopentasiloxane, or 1,3,5,7,9,11-hexavinylcyclohexasiloxane: wherein X represents a hydrogen atom, aryl group, allyl group, or glycidyl group, and Y represents a hydrogen atom, alkyl group, aryl group, allyl group, or glycidyl group, and n represents an integer of 2 to 8, and wherein the hydrolysis and condensation are carried out in the presence of (C-1) a metal chelate compound shown by the following general formula or an acidic compound: R 8 e M(OR 9) f-e wherein R 8 represents a chelating agent, M represents a metal atom, R 9 represents an alkyl group having 2 to 5 carbon atoms or an aryl group having 6 to 20 carbon atoms, f represents the valence of the metal M, and e represents an integer of 1 to f. at least one silane compound selected from a compound (A-1) shown by the following general formula, a compound (A-2) shown by the following general formula, and a compound (A-3) shown by the following general formula, R a Si(OR 1) 4-a wherein R represents a hydrogen atom, a fluorine atom, or a monovalent organic group, R 1 represents a monovalent organic group, and a represents 1 or 2; Si(OR 2) 4 wherein R 2 represents a monovalent organic group; R 3 b (R 4 O) 3-b Si-(R 7) d -Si(OR 5) 3-c R 6 c wherein R 3, R 4, R 5, and R 6 individually represent a monovalent organic group, b and c individually represent an integer of 0 to 2, R 7 represents an oxygen atom, a phenylene group, or a group -(CH 2) m -, wherein m represents an integer of 1 to 6, and d represents 0 or 1; and a cyclic silane compound shown by the following general formula, or being 1,3,5,7-tetravinyl-1,3,5,7-tetramethylcyclotetrasiloxane, 1,3,5-trivinylcyclotrisiloxane, 1,3,5,7-tetravinylcyclotetrasiloxane, 1,3,5,7,9-pentavinylcyclopentasiloxane, or 1,3,5,7,9,11-hexavinylcyclohexasiloxane: wherein X represents a hydrogen atom, aryl group, allyl group, or glycidyl group, and Y represents a hydrogen atom, alkyl group, aryl group, allyl group, or glycidyl group, and n represents an integer of 2 to 8, and wherein the hydrolysis and condensation are carried out in the presence of (C-1) a metal chelate compound shown by the following general formula or an acidic compound: R 8 e M(OR 9) f-e wherein R 8 represents a chelating agent, M represents a metal atom, R 9 represents an alkyl group having 2 to 5 carbon atoms or an aryl group having 6 to 20 carbon atoms, f represents the valence of the metal M, and e represents an integer of 1 to f. wherein X represents a hydrogen atom, aryl group, allyl group, or glycidyl group, and Y represents a hydrogen atom, alkyl group, aryl group, allyl group, or glycidyl group, and n represents an integer of 2 to 8, and wherein the hydrolysis and condensation are carried out in the presence of (C-1) a metal chelate compound shown by the following general formula or an acidic compound: R 8 e M(OR 9) f-e wherein R 8 represents a chelating agent, M represents a metal atom, R 9 represents an alkyl group having 2 to 5 carbon atoms or an aryl group having 6 to 20 carbon atoms, f represents the valence of the metal M, and e represents an integer of 1 to f.