An improved anterior pelvic support device is provided for use in securely and safely positioning a patient during a surgical procedure, such as hip or pelvis surgery. The support device comprises a double-ended bracket arm having a pair of padded support members at opposite ends thereof and adjustably carried on a bracket post adapted for secure mounting as by clamping onto an operating table. The bracket arm is adjustably positioned to support the patient lying on one side in a lateral decubitis position, with the padded support members applied to bony prominences particularly such as the symphysis pubis and the lower side anterior superior iliac spine. The support device is used in combination with a posterior pelvic support plate, and a pair of anterior-posterior chest support plates to retain the patient in a secure and stable manner during surgery.