A refrigerator (1, 2) comprising: a main body; a storage compartment that is formed inside the main body; a shelf coupling unit (80, 810, 820) that is provided at an inner rear side of the storage compartment (21, 22); and cantilever shelves which are coupled to the shelf coupling unit (80, 810, 820) to be supported, characterized in that each cantilever shelf includes: a fixed shelf that has side frames protruding forward from both sides thereof; hanger brackets which are respectively provided at the both sides of the fixed shelf so as to support the fixed shelf and having a coupling ring coupled to the shelf coupling unit; a slide shelf that is provided so as to be slidably movable between the side frames; a folding shelf that is rotatably provided at a rear side of the slide shelf between the side frames; and a spread prevention unit (340, 530; 360, 620; 350, 540) that prevents the side frames from being mutually spread by a load exerted on the cantilever shelves, wherein the spread prevention unit includes first spread prevention protrusions respectively provided at both sides of the slide shelf and first spread prevention grooves respectively provided in the side frames, so that the first spread prevention protrusions are inserted into the first spread prevention grooves when the slide shelf is maximally drawn out. a main body; a storage compartment that is formed inside the main body; a shelf coupling unit (80, 810, 820) that is provided at an inner rear side of the storage compartment (21, 22); and cantilever shelves which are coupled to the shelf coupling unit (80, 810, 820) to be supported, characterized in that each cantilever shelf includes: a fixed shelf that has side frames protruding forward from both sides thereof; hanger brackets which are respectively provided at the both sides of the fixed shelf so as to support the fixed shelf and having a coupling ring coupled to the shelf coupling unit; a slide shelf that is provided so as to be slidably movable between the side frames; a folding shelf that is rotatably provided at a rear side of the slide shelf between the side frames; and a spread prevention unit (340, 530; 360, 620; 350, 540) that prevents the side frames from being mutually spread by a load exerted on the cantilever shelves, wherein the spread prevention unit includes first spread prevention protrusions respectively provided at both sides of the slide shelf and first spread prevention grooves respectively provided in the side frames, so that the first spread prevention protrusions are inserted into the first spread prevention grooves when the slide shelf is maximally drawn out. a fixed shelf that has side frames protruding forward from both sides thereof; hanger brackets which are respectively provided at the both sides of the fixed shelf so as to support the fixed shelf and having a coupling ring coupled to the shelf coupling unit; a slide shelf that is provided so as to be slidably movable between the side frames; a folding shelf that is rotatably provided at a rear side of the slide shelf between the side frames; and a spread prevention unit (340, 530; 360, 620; 350, 540) that prevents the side frames from being mutually spread by a load exerted on the cantilever shelves, wherein the spread prevention unit includes first spread prevention protrusions respectively provided at both sides of the slide shelf and first spread prevention grooves respectively provided in the side frames, so that the first spread prevention protrusions are inserted into the first spread prevention grooves when the slide shelf is maximally drawn out.