A ratchet socket may include a main body, and an outer periphery of the main body has ratchet teeth formed in an endless circular pattern to form the main body with a polygonal cross section. The main body comprises a hexagonal inner periphery to form six internal angles and six inner edges. Each of the inner edges has an engaging portion at a middle portion thereof, and each of the inner edges comprises two abutting portions at two sides of the engaging portion between the engaging portion and each of two adjacent internal angles. Each of two recess portions is formed between the engaging portion and the abutting portion to form two engaging teeth on two lateral edges of the engaging portion. Each of the internal angles is curved to form an inclined surface between the abutting portion and the adjacent internal angle.