Writing utensil with pressurizing mechanism

A writing utensil with a pressurizing mechanism that is configured to pressurize an air layer on a rear end side of a refill stored in a shaft tube, wherein

• the refill is provided with an annular valve element formed along a rear end opening of the refill, and a cylinder that forms, at a rear side of the valve element, a pressurizing chamber communicating with the air layer, by covering the rear end opening and the valve element from the rear side,
• the cylinder is provided in such a manner that it comes into sliding contact with an outer peripheral part of the valve element and move back and forth, and an inner wall face of the cylinder is provided with a ventilating recess communicating with outside air, and an annular non-pressure contact face positioned on a rear side of the ventilating recess, and
• when the cylinder moves forward, the valve element is brought into pressure contact with the non-pressure contact face to seal the pressurizing chamber, and when the cylinder moves backward, the valve element is moved forward and separated from the non-pressure contact face such that the ventilating recess communicates with the pressurizing chamber.