An ergonomic pen having a convex device for an index finger exerting force thereon includes a first indentation proximate a tip thereof, a second indentation besides the first indentation, and an elongate member between the first and second indentations. The elongate member has a convex top surface. The first indentation is adapted to be urged by the muscle opposing the finger nail of the thumb, the second indentation is adapted to be urged by the muscle opposing the finger nail of the middle finger, and the elongate member is adapted to be urged by the muscle opposing the finger nail of the index finger, respectively, with the wrist being disposed in a relatively relaxed position in writing. Easy, labor saving writing can be effected.