An object of the present invention is to provide an innovative opening-closing tool with extremely high product value. A first half-body 1 having a first operating part 1a on the distal end and a first handle part 1b on the proximal end and a second half-body 2 having a second operating part 2a on the distal end and a second handle part 2b on the proximal end have a cross-over pivot, and a biasing body 3 that abuts the second half-body 2 and provides an open bias on the two handle parts 1b, 2b is provided on the first half-body 1.