The connector matable with a mating connector comprises a housing, a lever and an attached member. The housing has a front end, a rear end and an accommodating portion. The accommodating portion communicates with the front end and the rear end. The accommodating portion has an upper portion, a lower portion and side portions. The side portions are formed on respective opposite ends in a width direction of the accommodating portion so as to couple the upper portion and the lower portion with each other. The lever is configured to mate the connector with the mating connector and accommodated in the accommodating portion so as to be pivotable. The attached member is other than the housing. The attached member is attached to the housing so as to couple the upper portion and the lower portion with each other at a position located between the side portions in the width direction.