It is a Kannon-zo (statue of the Kannon) that raises its knee and offers a lotus pedestal (to receive restless spirits) in its hands, and it's believed that it wasn't a single statue but made as a kyoji (attendant figure) of Amida Sanzon-zo (the image [figure, statue] of the Amida Triad).
片膝を立て、両手で蓮台（亡者を迎え取るためのもの）を捧げる観音像で、もとは単独像でなく阿弥陀三尊像の脇侍として作られたものと推定される。