To press a first component and a second component into a seal member without destroying the seal member.

A connecting tool 1 uses a seal member 6 of drug solution equipment for interconnecting a first component 2 made of resin and a second component 3 made of resin, to temporarily insert a connection between the first component 2 and the second component 3 into a recess formed in the seal member 6. The connection between the first component 2 and the second component 3 is pressed into the recess, to interconnect the first component 2 and the second component 3. The connecting tool 1 includes a first engaging member 7 having a first engaging part 27 to be engaged with the first component 2, and a second engaging member 8 having a second engaging part 28 to be engaged with the second component. A fixing shaft 10 is fixed to the first engaging member 7. The second engaging part 8 is slidably held at the fixed shaft 10. The fixed shaft 10 and a cam member 9 are connected by a connecting member 20. The second engaging part 8 is engaged with the cam member 9.