During a 1968 presentation by Douglas Engelbart marking the public debut of a mouse,
Engelbart used a control console designed by Jack Kelley of Herman Miller that included a keyboard and an inset portion used as a support area for the mouse.
According to Kelley and also stated by Alex Pang,
Kelley designed the first mousepad a year later, in 1969.
Details of a mousepad designed by Armando M. Fernandez were published in the Xerox Disclosure Journal in 1979 with the description:
CRT CURSER CONTROL MECHANISM PAD
To assist the operation of a cathode ray tube pointer 10
wherein a metal ball is rolled on a hard surface, the disclosed pad may be utilized.
A resilient, rubber-like material 12 is bonded or otherwise attached to a hard base material 14 which keeps the rubber-like material flat.
The base has four rubber-like pads 16 on the opposite side from the resilient material
to refrain the pad from sliding on the surface of a table, for instance.
The OED tracks the term mouse pad to the 25 August, 1983,
publication of InfoWorld,
and the predominantly British term mousemat to 17 October, 1989,
in the publication 3D.

The first computer mouse was invented by Mr. Douglas Englebart.
A contemporary computer mouse,
with the most common standard features:
two buttons and a scroll wheel.
In computing,
a mouse (plural mice or mouses)
functions as a pointing device by detecting two-dimensional motion relative to its supporting surface.
Physically, a mouse consists of a small case,
held under one of the user's hands,
with one or more buttons.
It sometimes features other elements,
such as "wheels",
which allow the user to perform various system-dependent operations,
or extra buttons or features can add more control or dimensional input.
The mouse's motion typically translates into the motion of a pointer on a display.
The name mouse,
coined at the Stanford Research Institute,
derives from the resemblance of early models
(which had a cord attached to the rear part of the device, suggesting the idea of a tail)
to the common eponymous rodent.
The first marketed integrated mouse
・shipped as a part of a computer and intended for personal computer navigation ・
came with the Xerox 8010 Star Information System in 1981.