A hot swap fan includes a fan and a holding member. The fan has an air inlet, an air outlet, and a sidewall connected between the air inlet and the air outlet. The holding member is bent to form a top portion and at least one side portion and affixed on the sidewall. The top portion is formed with at least one handle portion, and part of the side portion is formed as a movable flexible portion connecting to the handle portion. The flexible portion is formed with an engaging structure to engage a casing that accommodates the hot swap fan.