A brake lining of a disc brake device is disclosed, wherein the brake lining includes a carrier and a friction block. The carrier has a bearing portion, which has the friction block provided thereon, and a guide portion connected to an end of the bearing portion. A first virtual line passes through a free end of the guide portion and a junction between the guide portion and the bearing portion, and a second virtual line passes through two opposite points of the disc periphery, wherein an included angle formed therebetween is greater than 0. The smallest possible included angle in any embodiments is formed if the first virtual line passes through an end corner of the friction block. With such design, the disc would not be hindered by nor collide with the friction block during installation, which reduces the difficulty and time for installing or fixing the disc brake device.