In the event of the alliance coming to power in the state in the next assembly election, HJC chief Kuldeep Bishnoi would be the chief minister for first two-and-a-half-year, the two leaders said.
BJP president Gadkari and senior leader Swaraj told the HJC foundation day rally in Sirsa that the alliance was as firm as a rock.
Swaraj said all issues that could destablise a coalition were carefully resolved at the time of BJP-HJC joining hands in 2011.
"These include the question of leadership while forming government and division of Lok Sabha and assembly seats among the partners. Therefore, there is no scope of the alliance breaking on any such issue," she said.
Attacking the Congress-led UPA government at the Centre, Gadkari said the only things the current dispensation had given to the people were unemployment, inflation and rising poverty.
Swaraj lashed out at the Congress-led government in Haryana alleging the law and order had worsened in the state.
"The daughters of Haryana are not safe and secure under the present dispensation," she said.