Optical filter and imaging device

The present invention addresses the problem of providing an infrared cutoff filter provided with a resin film having high adhesion to an absorber glass substrate comprising a phosphate glass or a fluorophosphate glass. This optical filter is obtained by providing a resin film on an absorber glass substrate comprising a phosphate glass or a fluorophosphate glass, with a bonding layer having a single-layer structure and containing Si atoms and at least one element selected from among Ti atoms, Zr atoms, and Al atoms interposed therebetween. Alternatively, the optical filter is obtained by providing a resin film containing Si atoms and at least one selected from the group consisting of Ti atoms, Zr atoms, and Al atoms on an absorber glass substrate comprising a phosphate glass or a fluorophosphate glass. 本发明的课题在于，提供一种设置有对由磷酸盐系玻璃或氟磷酸盐玻璃构成的吸收玻璃基板具有高密合性的树脂膜的红外截止滤光片。本发明的滤光片是对由磷酸盐系玻璃或氟磷酸盐系玻璃构成的吸收玻璃基板隔着含有Si原子、以及选自Ti原子、Zr原子及Al原子中的一种以上的具有单层结构的接合层设置树脂膜而成的滤光片、或者是对由磷酸盐系玻璃或氟磷酸盐系玻璃构成的吸收玻璃基板设置包含Si原子、及选自Ti原子、Zr原子及Al原子中的一种以上的树脂