To investigate the behavior of footing under seismic loading, three 1/3 scale monolithic specimens composed of a pier, a footing, and piles were constructed, and they were loaded by the montonic loading procedure, using the shear span ratio and reinforcement ratio in the footing as the parameters. According to the test results, dominating damage was the damage at the connection up to the maximum load regardless of the difference in the shear span ratio(a/d). Shear failure was occurred by the lateral force acting to the pile and column, after the main reinforcement was yielded.