Kajino was born in Aichi Prefecture on July 11, 1960. After graduating from Tokyo University of Agriculture, he joined Japan Soccer League club Yanmar Diesel in 1983. The club won 1983 and 1984 JSL Cup. From 1988, his brother Satoshi Kajino joined Yanmar and they played together. In 1992, he moved to J1 League club Gamba Osaka. In 1994, he moved to Japan Football League club Kashiwa Reysol. In 1994, the club won the 2nd place and was promoted to J1 League. He retired in 1995.