The Labour leader has secured the 326 seats required for a majority in the House of Commons - putting an end to 14 years of Conservative rule.
Shortly afterwards, a gleaming Sir Keir told a crowd of supporters: "We did it, you campaigned for it, you fought for it, you voted for it and now it has arrived, change begins now."
Speaking after he held on to his seat, a solemn-looking Mr Sunak said his party had faced a "difficult night" and he took full responsibility for the results.
The results mean a Labour prime minister in Number 10 for the first time since 2010 and the Conservatives facing a fight over the future direction of the party.
And Mr Shapps hit out at the Tory "soap opera" which had turned off voters, as he warned his party against going "off on some tangent, condemning ourselves to years of lacklustre opposition".
The success of Reform UK saw Nigel Farage win in Clacton - his eighth attempt at entering parliament - alongside former Tory Lee Anderson, who won his seat of Ashfield, and Rupert Lowe, who took Great Yarmouth for the party.
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