A brake device includes: an extendable and contractable coupling member that couples one end portions of a pair of link arms to each other; and an adjuster that causes the coupling member to extend so that positions of brake linings relative to brake discs are adjusted to be constant. The adjuster includes: an extension mechanism that has an extension shaft with a male thread and an extension nut with a female thread, which is threadedly engaged with the male thread, and causes the coupling member to extend; and a pressing spring that presses the extension nut in an axial direction toward a contact surface, which is provided in a main body recess portion housing the extension nut and is in contact with one end portion of the extension nut.