A bogie and side frame thereof; the two vertical sides of the side frame are provided with a support base (1) connected with the end of a connecting rod and integrally cast with the side frame; the support base (1) comprises a support plate (11), a middle vertical bar (12), and a first side surface vertical bar (13); the support plate (11) is provided with a through hole thereon; the connecting rod is connected to the support base (1) via beveled post threads fixedly provided in the through hole. The side frame reduces the welding process, ensures the installation precision of the support base (1), and improves the strength of the support base (1).
