Abstract: A biaxial hinge device and a mounting mechanism thereof for a mobile terminal is provided. The biaxial hinge device includes a first hinge module for rotatably connecting the folder to the body around a first hinge axis, and a second hinge module for rotatably connecting the folder to the body around a second hinge axis, which is spaced apart form the first hinge axis and disposed in a direction substantially perpendicular to the first hinge axis. A portion of a second hinge module is inserted in the first hinge module, thereby allowing the second hinge module to move both independently of and in cooperation with the first hinge module.