Lens module and projection device

The invention relates to a lens module. The lens module is used for providing an image beam. The lens module comprises a limiting element, a first lens, a second lens and a third lens. The first lens is arranged on one side of the limiting element. The second lens is arranged on the other side of the limiting element. The second lens is positioned between the limiting element and the third lens, wherein the edges of the first lens, the limiting element, the second lens and the third lens respectively comprise at least one connecting structure, and the first lens, the limiting element, the second lens and the third lens are mutually matched by the at least one connecting structure itself to be stacked to form a lens module. The lens module can reduce the volume of the lens module and can reduce the weight of the projection device. 一种镜头模块，用于提供一影像光束。镜头模块包括一限位元件、一第一透镜、一第二透镜以及一第三透镜。第一透镜配置于限位元件的其中一侧。第二透镜配置于限位元件的其中另一侧。第二透镜位于限位元件与第三透镜之间，其中第一透镜、限位元件、第二透镜以及第三透镜的边缘分别包括至少一连接结构，且第一透镜、限位元件、第二透镜以及第三透镜分别藉由各自的至少一连接结构相互适配而堆叠形成