Optical filter and imaging device

An optical filter, comprising a glass substrate,

• wherein
• the glass substrate has a first main surface and a second main surface, which are opposite to each other,
• on the first main surface of the glass substrate, a first barrier layer, a resin layer, and a first multilayer film are arranged in this order from the glass substrate,
• on the second main surface of the glass substrate, a second barrier layer and a second multilayer film are arranged in this order from the glass substrate,
• the glass substrate is a phosphate glass comprising an infrared absorber,
• each of the first barrier layer and the second barrier layer independently comprises, in an amount of 80 mol % or more, an oxide of at least one metal selected from the group consisting of titanium (Ti), niobium (Nb), tantalum (Ta), and hafnium (Hf),
• the resin layer comprises a near-infrared absorbing dye having a maximum absorption wavelength in a range of 700 nm to 800 nm, and
• each of the first multilayer film and the second multilayer film is independently composed of plural dielectric layers.