An optical sensing apparatus includes a laser device, a photodetector, and a control circuit. The laser device includes a light source that emits laser light, a diffusing member having a diffusing surface that crosses an optical path of the laser light, the diffusing member making the laser light lower in intensity in a first portion, making the laser light higher in intensity in a second portion, and enlarging a beam diameter of the laser light, and a screen, and irradiates a physical object with the laser light having passed through the screen or the laser light reflected by the screen. The control circuit causes the laser device to irradiate the physical object with at least one optical pulse of the laser light and causes the photodetector to perform a time-resolved measurement of at least one reflected optical pulse of the laser light returning from the physical object.
