A scanning mirror device includes a mirror, a first supporting body that supports the mirror, a plurality of securing materials that has higher rigidity than the first supporting body and supports the first supporting body, a reinforcing material that has higher rigidity than the first supporting body and is attached to the plurality of securing materials on a surface different from a surface on which the mirror is disposed, and a first driving portion that deforms the first supporting body so as to cause the mirror to be displaced around a first axis.