A side open-and-close type cash transaction machine is provided. A cash transaction machine includes: a body including an opening on a side of the body; a door being mounted on the body to open and close the opening; a first financial module being integrally formed with the door in the door to be externally exposed when the door is opened; and a second financial module being provided in the body, separate from the door to move toward the opening when the door is opened. Since the second financial module may be provided and be exposed separate from the first financial module, it is possible to easily manage the financial modules and also reduce the size of the side open-and-close type cash transaction machine.