The coming together of the two saffron parties, which split before the Assembly elections and fought against each other, was announced by Chief Minister Devendra Fadnavis who held parleys with Shiv Sena leaders in the last few days.
"It is the desire of the people of Maharashtra that BJP and Shiv Sena should be part of the government," he told reporters, addressing a joint press conference with senior Sena leaders.
With Sena now set to join the government, Fadnavis can breathe easy during the winter session of legislature, beginning in Nagpur on December 8.
In an indication of BJP's dominance, Fadnavis ruled out having a deputy chief minister in the ministry.
12 ministers from Sena, including five of cabinet rank will be inducted, the chief minister said. Around 8 to 10 BJP ministers will take oath tomorrow, he added.