Born in Zagreb, he started playing in a local club NK Ponikve.
That year he moved to FK Borac Banja Luka and played another 5 seasons there.
By the end of his career he played with Yugoslav Second League sides Metalac Sisak and HNK Segesta.
He also scored 15 goals during his time in Rijeka as he was a regular penalty kick taker.
Jantoljak made his debut for Yugoslavia in an October 1966 friendly match away against Israel, coming on as a 66th-minute substitute for Ilija Pantelić, and earned a total of 2 caps scoring no goals.