A unit brake (1, 2) comprising: a pushing rod which is arranged to move in and out to and from a brake main body (11, 41); a shoe head which is rotatably connected to a leading end portion of the pushing rod in an advancing direction and to which a brake shoe which contacts a wheel to brake the rotation of the wheel is attached; a link component which is connected to the shoe head, characterised in that: the unit brake (1, 2) further comprises an extension portion which is integrated with the pushing rod and is connected with the shoe head at a position remote from the junction between the shoe head and the pushing rod; the link component is connected to the shoe head at a position above a junction between the shoe head and the pushing rod to be rotatable about an axis which is substantially in parallel to a rotation axis about which the shoe head rotates with respect to the pushing rod; the unit brake (1, 2) further comprises a pair of supporting arms (15, 45) which are connected in an integrated manner to the brake main body (11, 41) to substantially horizontally protrude from a front surface of the brake main body (11, 41) or from a corner between the front surface and a lower end surface of the brake main body (11, 41) at a position below the junction between the shoe head and the pushing rod, are provided on both sides of the shoe head in a width direction, and are connected to a lower end portion of the link component so that the link component is rotatable; and the supporting arms (15, 45) are provided above the junction between the extension portion and the shoe head. a pushing rod which is arranged to move in and out to and from a brake main body (11, 41); a shoe head which is rotatably connected to a leading end portion of the pushing rod in an advancing direction and to which a brake shoe which contacts a wheel to brake the rotation of the wheel is attached; a link component which is connected to the shoe head, characterised in that: the unit brake (1, 2) further comprises an extension portion which is integrated with the pushing rod and is connected with the shoe head at a position remote from the junction between the shoe head and the pushing rod; the link component is connected to the shoe head at a position above a junction between the shoe head and the pushing rod to be rotatable about an axis which is substantially in parallel to a rotation axis about which the shoe head rotates with respect to the pushing rod; the unit brake (1, 2) further comprises a pair of supporting arms (15, 45) which are connected in an integrated manner to the brake main body (11, 41) to substantially horizontally protrude from a front surface of the brake main body (11, 41) or from a corner between the front surface and a lower end surface of the brake main body (11, 41) at a position below the junction between the shoe head and the pushing rod, are provided on both sides of the shoe head in a width direction, and are connected to a lower end portion of the link component so that the link component is rotatable; and the supporting arms (15, 45) are provided above the junction between the extension portion and the shoe head. the unit brake (1, 2) further comprises an extension portion which is integrated with the pushing rod and is connected with the shoe head at a position remote from the junction between the shoe head and the pushing rod; the link component is connected to the shoe head at a position above a junction between the shoe head and the pushing rod to be rotatable about an axis which is substantially in parallel to a rotation axis about which the shoe head rotates with respect to the pushing rod; the unit brake (1, 2) further comprises a pair of supporting arms (15, 45) which are connected in an integrated manner to the brake main body (11, 41) to substantially horizontally protrude from a front surface of the brake main body (11, 41) or from a corner between the front surface and a lower end surface of the brake main body (11, 41) at a position below the junction between the shoe head and the pushing rod, are provided on both sides of the shoe head in a width direction, and are connected to a lower end portion of the link component so that the link component is rotatable; and the supporting arms (15, 45) are provided above the junction between the extension portion and the shoe head.