The function was also attended by former CM O Ibobi Singh and other top senior government officers.
Manipur Chief Minister N Biren Singh, Deputy CM Y Joykumar and other top civil and police officers attended the swearing in ceremony.
C P Joshi questioned the role of the Governor in Manipur and accused her of playing into the hands of the ruling party.
The BJP has come to power after 15 years of Congress rule in Manipur that was led by Okram Ibobi Singh.
The BJP-led coalition in Manipur includes allies NPP, NPF, LJP and others.
Manipur Highlights: Although the Congress emerged as the single largest party with 28 MLAs, the BJP, with 21 MLAs, claims to have the support of NPP (4), NPF (4), LJP (1), and three others.
Biren’s popularity with other MLAs may have swung the vote in his favour after a round of hectic lobbying between him and party favourite Bishwajit Singh.
Since March 11, there has been high drama and political tussles over formation of the government in Manipur, with both the Congress and BJP claiming that they have the numbers.
She further said that the BJP-led group has been invited tomorrow to form the Government.
Earlier, in an interview with Indian Express, Irom Sharmila had said that that 'people would have voted for her but their right to vote has been occupied by money'.
Union minister Piyush Goyal had confirmed his candidature as the CM of the state as well.
Meanwhile, incumbent Chief Minister Okram Ibobi Singh submitted his resignation to the Governor in the evening.
Last year, Nongthombam Biren left the Congress, his party since 2007, to join the BJP.
The BJP has claimed it enjoyed the support of 32 MLAs in the 60-member assembly.
Biren thanked Prime Minister Narendra Modi and the BJP leadership for giving him an opportunity to serve Manipur.
Currently, the BJP claims to enjoy the support of 32 MLAs in the 60-member assembly.
The BJP claims to enjoy the support of 32 MLAs in the 60-member assembly.
Gaikhangam also described as "completely baseless" the reports that several Congress legislators, including Shyam Kumar, were in touch with the BJP and expressed a desire to support a BJP government.
Currently, the BJP claims to have the support of 31 MLAs in the 60-member assembly.
A day that saw the BJP steal a march over the Congress in a show of strength before the Governor in Manipur couldn’t have had a more apt moment.
Senior Congress leader C P Joshi, deputed from Delhi and present at the party headquarters, accused the BJP of flouting “the norms of democracy”.
Calling the BJP opportunistic Ibobi Singh said that the BJP had categorically denied tie ups with the naga peoples front ahead of the assembly elections.
As per the Constitution and norms, the single largest party is always invited to form the government, Congress spokesperson Randeep Surjewala said.
BJP general secretary Ram Madhav said the NPP and the LJP have extended their support to BJP to form the government.
The election threw up a hung verdict with none of the two mainstream parties, BJP and Congress being able to cross the magic figure of 31 in the 60-member Assembly.
The BJP did well in the valley, where the Congress was hoping to reap the benefits of economic blockade.
Manipur on Saturday threw up a hung assembly with the ruling Congress bagging 28 of the 60 seats and the BJP winning 21.
BJP leaders had earlier told The Indian Express that the party would look to form the government if it crosses the 20-seat mark, and it could now find willing allies among the 10 winners of smaller parties.
The results at the Thoubal constituency, where Irom lost to CM Okram Ibobi Singh, is not a surprise to most. Singh has remained unbeaten there for three terms now.
N Giridhar Singh, who is General Secretary of Association of Manipuri Diaspora, felt it would have done good to the state if the election had brought change of power.
Ibobi, with his decision to create seven new districts, was able to shift the poll plank on the issue of economic blockade and threat to territorial integrity of Manipur if the BJP comes to power.
Rights activist Irom Sharmila, who had contested against the Chief Minister, was relegated to fourth position after securing only 90 votes.
In today's election result, Irom Sharmila lost to chief minister Okram Ibobi Singh in Thoubal constituency.
Manipur Election Result 2017: Sharmila managed to get less than 100 votes while Ibobi secured over 15,000 votes.
According to CVoter, Inner Manipur has its votes divided between BJP and Congress
Manipur elections results 2017: The state is currently governed by Congress with Okram Ibobi Singh as the chief minister who has held the position since 2002.