An information processor having an input device which accepts an input from a user, and a cover which is connected to the input device so as to be openable and closeable, and which covers at least part of the input device when it is closed. The information processor includes a hinge which connects the input device to the cover so that the input device and the cover are openable and closeable by rotation about a predetermined rotation axis, a frictional resistance maintaining section which maintains frictional resistance between the input device and the cover in the hinge to maintain the angle of the cover from the input device, an operating section which accepts from a user a reduction instruction to reduce the frictional resistance, and a frictional resistance reducing section which reduces the frictional resistance in the hinge when the reduction instruction is accepted.