A slide unit comprising: a main body; a fixed rail fixed to the main body, and provided with a first accommodation space at an inner side thereof; a drawer body interposed between the main body and the fixed rail; a movable rail connected to the drawer body to allow the drawer body to be pulled out from and pushed into the main body, provided with a second accommodation space at an inner side thereof, and configured to be movable with respect to the fixed rail; an inner rail configured such that a first end thereof is inserted in the first accommodation space and a second end thereof is inserted in the second accommodation space, so as to allow the movable rail to be slidable with respect to the fixed rail; a plurality of slide balls inserted in the first accommodation space to be disposed between the fixed rail and the inner rail, and inserted in the second accommodation space to be disposed between the movable rail and the inner rail; insertion parts inserted into the first accommodation space and the second accommodation space, respectively; and a connection part connecting the insertion parts together, and being bent to protrude toward one side; a pair of first rolling surfaces grooved inwardly at opposite sides of an end of the insertion part, with a pair of first slide balls seated thereon; a pair of second rolling surfaces grooved inwardly at positions spaced apart from the first rolling surfaces at predetermined intervals toward the connection part, with a pair of second slide balls seated thereon; a reinforcing stepped surface connecting the second rolling surfaces and the connection part together, and being configured such that a width thereof is gradually reduced in a direction from the second rolling surfaces toward the connection part; extending portions extending from the insertion parts; bent portions being bent from ends of the extending portions and extending toward one side; and a center portion connecting the bent portions together, characterised in an angle (θ) formed by each of the bent portions and a surface of the center portion facing the main body is greater than 90° and less than 140°. a main body; a fixed rail fixed to the main body, and provided with a first accommodation space at an inner side thereof; a drawer body interposed between the main body and the fixed rail; a movable rail connected to the drawer body to allow the drawer body to be pulled out from and pushed into the main body, provided with a second accommodation space at an inner side thereof, and configured to be movable with respect to the fixed rail; an inner rail configured such that a first end thereof is inserted in the first accommodation space and a second end thereof is inserted in the second accommodation space, so as to allow the movable rail to be slidable with respect to the fixed rail; a plurality of slide balls inserted in the first accommodation space to be disposed between the fixed rail and the inner rail, and inserted in the second accommodation space to be disposed between the movable rail and the inner rail; insertion parts inserted into the first accommodation space and the second accommodation space, respectively; and a connection part connecting the insertion parts together, and being bent to protrude toward one side; a pair of first rolling surfaces grooved inwardly at opposite sides of an end of the insertion part, with a pair of first slide balls seated thereon; a pair of second rolling surfaces grooved inwardly at positions spaced apart from the first rolling surfaces at predetermined intervals toward the connection part, with a pair of second slide balls seated thereon; a reinforcing stepped surface connecting the second rolling surfaces and the connection part together, and being configured such that a width thereof is gradually reduced in a direction from the second rolling surfaces toward the connection part; extending portions extending from the insertion parts; bent portions being bent from ends of the extending portions and extending toward one side; and a center portion connecting the bent portions together, characterised in an angle (θ) formed by each of the bent portions and a surface of the center portion facing the main body is greater than 90° and less than 140°.