Singh, who represented Khandapada constituency in the Odisha Assembly between 2009 and 2014, joined BJP along with supporters in the presence of Union Petroleum Minister Dharmendra Pradhan and state BJP chief Basant Panda here.
The 40-year-old leader, who had been denied a party ticket by the BJD in the 2014 elections, was apparently upset and felt ignored by the ruling party since then.
While resigning, he had expressed displeasure over not being given due importance in the BJD.
The erstwhile royal family member said he would work hard for putting an end to the misrule of BJD and ensuring victory for BJP in next elections.
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All the misdeeds of BJD government including gross irregularities in the preparation and distribution of ration cards under National Food Security Act (NFSA) would be presented before the people, he said.
Union Minister Pradhan said Singh and his supporters would highlight BJD regime's failure on all fronts in Odisha and tell people about various developmental and welfare programmes launched by the NDA government at the Centre and good governance during the Narendra Modi rule.