Optical filter and imaging device

An optical filter, comprising:

• a resin substrate comprising a resin (P) which has a glass transition temperature of 200° C. or higher and which, when having a thickness of 100 μm, has an average internal transmittance in a 350-450 nm wavelength range of 95% or higher and a minimum internal transmittance in a 400-450 nm wavelength range of 97% or higher in a spectral transmittance curve over a wavelength range of 350 nm to 1,100 nm;
• an external resin layer that is disposed on at least one of main surfaces of the resin substrate and that comprises at least one of a polyimide resin and an alicyclic epoxy resin;
• and
• dielectric multilayer films disposed as outermost layers on both main surfaces of the resin substrate,
• wherein:
• in a case where the external resin layer comprises the polyimide resin, the optical filter comprises an intermediate resin layer comprising a cycloolefin resin, the intermediate resin layer being disposed between the resin substrate and the external resin layer;
• at least one of the dielectric multilayer films is a near-infrared reflection layer;
• at least one of the external resin layer and the intermediate resin layer contains a near-infrared absorbing dye (A);
• the near-infrared absorbing dye (A), when examined in a resin included in the resin layer containing the near-infrared absorbing dye (A), has a maximum absorption wavelength λmax(A)TR within a wavelength range of 800 nm to 1,200 nm in a spectral transmittance curve over a wavelength range of 400 nm to 1,200 nm;
• and
• the optical filter has a proportion of a total thickness of members including a resin having a glass transition temperature of 200° C. or higher to a total thickness of the resin-including members of 85% or higher.