Refrigerator

According to the present invention, a refrigerator includes: a main body having a storage chamber in the inside; and a shelf assembly, wherein the height of a shelf is adjustable, installed in the storage chamber. The shelf assembly includes: the shelf installed to be vertically moved inside the storage chamber; a frame vertically moving and supporting the shelf; a pair of rotation gears arranged on both sides of the frame; a pair of guide brackets arranged on both sides of the frame; a pair of sliders moving frontward and rearward inside the guide brackets by the rotation gears and having at least a pair of protrusions on the outside of the sliders; an electric apparatus transmitting a rotational force of the rotation gear to the sliders to enable the sliders to horizontally move; at least a pair of guide grooves formed to be tilted on the inner surface of the storage chamber to guide movement of at least the pair of the protrusions; and a rotation device rotating the rotation gears.