Drum brake apparatus

A drum brake apparatus comprising:

• a housing;
• a main braking part installed on one side of the housing, and driven by hydraulic pressure so as to press a shoe during main braking;
• and
• a parking braking part installed on an other side of the housing, and driven by an electromotive force of an actuator so as to press the shoe during parking braking,
• wherein the housing comprises:
• a housing part;
• a piston housing part formed on the housing part, the piston housing part having a hollow portion formed therein and having the main braking part installed therein;
• and
• a rod housing part formed on the housing part, the rod housing part having a hollow portion formed therein, having the parking braking part installed therein, and disposed at a location farther from a rotation center of the shoe than the piston housing part,
• wherein the housing part comprises:
• a main body part in which the piston housing part and the rod housing part are formed;
• a fixing part formed on the main body part and fixed to a back plate;
• and
• a foreign matter introduction prevention part coupled to a side portion of the main body part where an opening of the piston housing part and an opening of the rod housing part are positioned, and configured to cover the edge of the piston housing part and the edge of the rod housing part.