A high chair has a chair device and a fastener device. The fastener device is connected with the chair device and has a main body, a button and a button elastic member. The main body has a buckle recess formed in the main body and having an open side. The button is capable of retracting or protruding relative to a bottom of the buckle recess. The button elastic member is mounted in the main body and presses against the button. To push and pull the button allows a belt buckle to be easily taken out from and inserted into the buckle recess.