There is provided a circuit device including: a circuit board; a housing configured to support the circuit board; and a bending adjuster configured to adjust bending of the circuit board supported by the housing, wherein the circuit board is supported by the housing by having a portion of the circuit board fixed to the housing, and wherein the bending adjuster includes: a reference member mounted on the housing and spaced apart from a non-fixed portion of the circuit board supported by the housing, the non-fixed portion being a portion that is not fixed to the housing; and a distance adjuster configured to adjust a distance between the non-fixed portion of the circuit board and the reference member such that the circuit board is deformed.