A laser scanner for scanning laser light toward a target object, the laser scanner comprising: a light source that emits laser light; a scanning mirror that scans the laser light from the light source toward the target object by oscillating about a predetermined axis, and reflects the laser light reflected from the target object; and a photodetector that receives, via the scanning mirror, the laser light reflected from the target object, wherein the scanning mirror includes: a first reflective surface that scans the laser light from the light source by reflecting the laser light from the light source; and a second reflective surface that reflects, toward the photodetector, the laser light reflected from the target object, wherein the first reflective surface and at least part of the second reflective surface are disposed at mutually different angles, and wherein when a first optical axis, which is the optical axis of laser light from the light source after reflecting off the first reflective surface and reaching the target object is parallel with a second optical axis, which is the optical axis of laser light from the light source after reflecting off the target object and reaching the second reflective surface, ▪then a third optical axis, which is the optical axis of laser light emitted from the light source and reaching the first reflective surface, and a fourth optical axis, which is the optical axis of laser light from the light source after reflecting off the first reflective surface, the target object, and the second reflective surface, and reaching the photodetector are at a predetermined angle relative to one another, said predetermined angle being twice the angle between first reflective surface and second reflective surface, characterized in that the scanning mirror has an inner wall defining an opening through which the laser light from the light source passes, the laser light passing through from a first surface side of the scanning mirror to an opposing second surface side of the scanning mirror, wherein the first reflective surface is formed on the inner wall defining the opening, reflects the laser light entering the opening from the light source, and scans the reflected laser light out of the opening toward the target object, and the second reflective surface is formed on the second surface of the scanning mirror and reflects, toward the photodetector, the laser light reflected from the target object, and the predetermined axis is perpendicular to a plane defined by the first optical axis and the third optical axis. a light source that emits laser light; a scanning mirror that scans the laser light from the light source toward the target object by oscillating about a predetermined axis, and reflects the laser light reflected from the target object; and a photodetector that receives, via the scanning mirror, the laser light reflected from the target object, a first reflective surface that scans the laser light from the light source by reflecting the laser light from the light source; and a second reflective surface that reflects, toward the photodetector, the laser light reflected from the target object, wherein the first reflective surface and at least part of the second reflective surface are disposed at mutually different angles, and wherein when a first optical axis, which is the optical axis of laser light from the light source after reflecting off the first reflective surface and reaching the target object is parallel with a second optical axis, which is the optical axis of laser light from the light source after reflecting off the target object and reaching the second reflective surface, ▪then a third optical axis, which is the optical axis of laser light emitted from the light source and reaching the first reflective surface, and a fourth optical axis, which is the optical axis of laser light from the light source after reflecting off the first reflective surface, the target object, and the second reflective surface, and reaching the photodetector are at a predetermined angle relative to one another, said predetermined angle being twice the angle between first reflective surface and second reflective surface, characterized in that the scanning mirror has an inner wall defining an opening through which the laser light from the light source passes, the laser light passing through from a first surface side of the scanning mirror to an opposing second surface side of the scanning mirror, wherein the first reflective surface is formed on the inner wall defining the opening, reflects the laser light entering the opening from the light source, and scans the reflected laser light out of the opening toward the target object, and the second reflective surface is formed on the second surface of the scanning mirror and reflects, toward the photodetector, the laser light reflected from the target object, and the predetermined axis is perpendicular to a plane defined by the first optical axis and the third optical axis.