At a height of , the square bell tower above the entrance porch has two identical storeys of five blind arches, of which the central arch has a window and a small balcony. This is surmounted by a belfry, with each face composed of a three-light window divided by red granite mullions, behind which are abat-sons. The belfry is covered by a square terrace, which is enclosed by a stone balustrade bearing the arms of the city on each side and an angel with a trumpet at each corner. These four statues were carved by Eugène-Louis Lequesne.