A lighting device is provided, including a housing, a light source module, a light guiding module, and a protective member. The housing has an accommodating space, and the light source module is disposed in the accommodating space. The light guiding module has a top surface, a bottom surface opposite to the top surface, a first lateral surface, and a second lateral surface opposite to the first lateral surface. The light from the light source module can be received by the top surface. The first and second lateral surfaces connect the top surface to the bottom surface. The protective member surrounds the first lateral surface, the bottom surface, and the second lateral surface. The opposite ends of the protective member are connected to the housing.