Head-mounted display device

A head-mounted display device, comprising:

• a body, having a lens holder and two optical lens sets, wherein the lens holder is used for accommodating a first lens and a second lens corresponding to both eyes;
• a first clamping part, disposed on the body and has a first free end portion, wherein the first clamping part is used to contact the first lens;
• a second clamping part, disposed on the body and has a second free end portion, wherein the second free end portion is used to contact the second lens;
• and
• a sliding part, slidably disposed on the body and between the first free end portion and the second free end portion, wherein when the sliding part slides along a first direction from an initial position, it first pushes the first free end portion and the second free end portion to make them abut against the first lens and the second lens respectively, and then pushes the first free end portion and the second lens portion to make them drive the first lens and the second lens to move respectively to change the distance from the body.