A lever type connector comprises a first connector housing; a second connector housing including a projection; and a lever pivotally engaged with the first connector housing and including two arm plates and an interconnecting bar which connects the two arm plates. The each arm plate comprises a provisional-retaining projection projecting from the arm plate toward the other arm plate, which abuts to the projection and causes to deform the arm plate so that the arm plate recedes to the other arm plate when the projection is inserted into the cam groove; and a cancellation lever extending from an edge of the arm plate and positioned at a counter side of the inlet with respect to the pivotal support, which cause to deform the arm plate so that the arm plate recedes to the other arm plate when the cancellation lever is pressed to come close to the other cancellation lever.