Control device for a computer, comprising a base for placing on a table or such like, a support for the human hand, provided with at least one switch, where said support comprises a thumb-supporting element and a curved finger-supporting element, said the thumb-supporting element and the curved finger-supporting element being located at different levels in the operating position, with said thumb-supporting element and said finger-supporting element merging into a common hand-supporting element, said hand-supporting element comprising a hand-supporting part extending at an angle from the base and wherein is the length of the control device measured along a first curve from the start of the hand-supporting part in a longitudinal direction along the surface of the control device to the end of the finger-supporting element via the highest point of the finger-supporting element; is the width of the finger-supporting element measured along a second curve from the highest point of the finger-supporting element in a transverse direction with respect to the longitudinal direction to a raised edge for retaining the little finger, characterised in that Y/X lies between 0.3 and 0.6 and wherein Z 1 is the height from the base to the highest point of the curvature of said finger-supporting element and Z 2 is the height from the base to the highest point of the thumb-supporting element and Z 1 /Z 2 is 1.6, wherein a portion of the first curve from the end to the highest point is conforming an arc of a circle J with a radius G and a centre being the intersection of the vertical projection of the highest point and the base; and wherein the sum of the radius G and a length P is equal to the length of the base wherein P is defined by the line segment from the start of the wrist-and hand-supporting element to the intersection of the vertical projection of the highest point and the base, and the ratio between the distance Y and the length P equals 0.8; and a portion of the second curve along from the highest point to the raised edge conforms an arc of a circle of radius R, where X and R have respectively the following values: X in mm R in mm 161 109 171 116 182 123 191 130 201 137 is the length of the control device measured along a first curve from the start of the hand-supporting part in a longitudinal direction along the surface of the control device to the end of the finger-supporting element via the highest point of the finger-supporting element; is the width of the finger-supporting element measured along a second curve from the highest point of the finger-supporting element in a transverse direction with respect to the longitudinal direction to a raised edge for retaining the little finger, characterised in that Y/X lies between 0.3 and 0.6 and wherein Z 1 is the height from the base to the highest point of the curvature of said finger-supporting element and Z 2 is the height from the base to the highest point of the thumb-supporting element and Z 1 /Z 2 is 1.6, wherein a portion of the first curve from the end to the highest point is conforming an arc of a circle J with a radius G and a centre being the intersection of the vertical projection of the highest point and the base; and wherein the sum of the radius G and a length P is equal to the length of the base wherein P is defined by the line segment from the start of the wrist-and hand-supporting element to the intersection of the vertical projection of the highest point and the base, and the ratio between the distance Y and the length P equals 0.8; and a portion of the second curve along from the highest point to the raised edge conforms an arc of a circle of radius R, where X and R have respectively the following values: X in mm R in mm 161 109 171 116 182 123 191 130 201 137