Ian Jones, 43, was last seen at around 3.45pm on Friday afternoon in the Barn Fold area of Waterlooville.
He is believed to be wearing a green jacket and is though to have his push bike with him.
A police statement said: ‘We’re growing increasingly concerned for his welfare and would ask anyone who thinks they may have seen him since 3.45pm yesterday to call us.’
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If you can help call police on 101 quoting incident 575.