A flush toilet capable of correcting a defecation posture, in which a seat disposed on a toilet main body for a user to sit is inclined on the top thereof such that the front where the user's thighs are placed is higher than the rear where the user's hips are placed. Accordingly, smooth defecation is allowed by preventing bending between the intestine and the anus in the body by correcting the posture of a user into a squatting posture such that an angle between the upper body and the thighs of the user is maintained between 35˜50° as if the user were using a squat toilet. Therefore, defecation time is reduced and the user's legs are prevented from becoming numb, thereby improving satisfaction with defecation. Further, intestinal movement is activated during defecation, so smooth defecation is possible, and constipation, hemorrhoids, irritable bowel syndrome, cancers, and other colorectal diseases are prevented.