The incident took place this afternoon at Mandwan village in Shirur, nearly 63 km from here, when Sunil More, son of a labourer who was working at a farm nearby, slipped into the borewell while playing, station duty officer at Shirur Police Station A J Jagdale said.
The boy got struck at 20-feet depth from the ground level, he added.
"Local administration along with fire brigade, medical team and police have reached the spot and an operation has been launched to rescue the boy," Jagdale said.