The present invention is a film-forming composition containing a polymer obtained by polymerizing (A) 5 to 80 mass% of a silicone resin having an R 3 SiO 1/2 unit, an R 2 R'SiO 1/2 unit, and an SiO 2 unit, where R may be the same or different and represents a monovalent hydrocarbon group having 1 to 6 carbon atoms, and R' represents a -C 3 H 6 SH group, in which a total amount of the R 3 SiO 1/2 unit, the R 2 R'SiO 1/2 unit, and the SiO 2 unit is 80 mol% or more with respect to all structural units, and a mole ratio expressed by (sum of R 3 SiO 1/2 unit and R 2 R' SiO 1/2 unit)/(SiO 2 unit) ranges from 0.5 to 1.5 and (B) 20 to 95 mass% of one or more radically polymerizable compounds, wherein the component (B) includes (B-1) one or more radically polymerizable monomers having no SiO unit in a structure thereof. This composition is capable of forming a transparent film that is excellent in adhesiveness and does not exhibit stickiness and secondary adhesion.