A stylus retaining mechanism is configured for retaining a stylus to a housing. The stylus includes a latching portion. The stylus retaining mechanism includes a locking assembly. The housing includes a fixing portion, an opening and a receiving chamber communicating with the opening. The receiving chamber is configured to receive a stylus, the housing including. The locking assembly is attached to the fixing portion. The locking assembly includes a locking member and an elastic member. One end of the elastic member is attached to the fixing portion, and the other end resists the locking member. The locking member includes a protrusion to engage with a latching portion of the stylus.