1. A cash machine comprising: an input unit receiving input from a user; an authentication device disposed side by side with the input unit; and a cash inlet/outlet; wherein the authentication device executes personal authentication using a feature of a vein pattern of an authentication part of a hand of a user set on the authentication device, receives the input using the other hand of a user in parallel with the personal authentication execution, and executes at least one of input/output of cash with the cash inlet/outlet when a user is authenticated; wherein the input unit is a touch panel which displays an instruction relating to the input; wherein said authentication device has a guide for positioning the hand of a user and said guide has a support body for contiguously holding at least two points on a part other than an image capture part of a hand of said user so that said image capture part extends between said at least two points and avoids contact with said authentication device; and wherein said cash machine is further provided with an operation panel in table orientation on which the authentication device and the input unit are disposed.