Sharad Pawar has served as a Union minister and also Chief Minister of Maharashtra. (File)

Nationalist Congress Party or NCP president Sharad Pawar didn't attend the oath-taking ceremony of Prime Minister Narendra Modi and his new team of ministers as the veteran politician was not allotted seat at the event "as per protocol", his party said on Thursday.

NCP chief spokesperson Nawab Malik expressed disappointment over the alleged episode, saying, "It was not right" given that Sharad Pawar is a senior national leader who had served as a Union minister and also Chief Minister of Maharashtra.

On Thursday evening, Prime Minister Narendra Modi was sworn-in as the Prime Minister for a second term heading a 57-member ministry.

The oath-taking ceremony was held at the forecourt of majestic Rashtraparti Bhavan in New Delhi.

Mr Malik said Mr Pawar's office had first checked seat allotment for him at the mega event, attended by 8,000 people, including leaders from the neighbouring countries.

According to media reports, the 78-year-old Maratha strongman was allotted a seat in the fifth row.

His office learnt he was not allotted seat for the event as per protocol.

Hence, he didn't attend the event.

"Whether they did it deliberately or it happened by mistake, it wasn't right given he is a senior leader," Mr Malik told news agency Press Trust of India.