Mechanical pencil comprising a tubular body extending along a longitudinal axis between a rear end which has a first opening and a front end which has a second opening, a lead capable of exiting through the second opening, and a lead feed mechanism arranged in the tubular body, the feed mechanism comprising: - a pusher device suitable for sliding parallel to the longitudinal axis, comprising an external portion which extends externally relative to the tubular body and an internal portion inserted into the tubular body through the first opening; - a clamp located on the front end side of the tubular body and capable of being clamped on the lead in a clamping position; - a reservoir which extends along the longitudinal axis and is suitable for accommodating at least one lead, the reservoir comprising a rear end surrounded by the internal portion of the pusher device and a front end suitable for moving the clamp when the pusher device slides toward the front end; the tubular body having, at the rear end, an annular wall for retaining the pusher device, characterized in that the annular wall comprises, on one internal face, two longitudinal slots (31b, 31c), each of the longitudinal slots having a rear edge delimited by one of two respective lugs (R1, R2) spaced apart, each of the two lugs projecting radially inward relative to the rest of the internal face of said annular wall, said lugs (R1, R2) belonging to the annular retention portion, being spaced apart and arranged on a minority part of the periphery of the annular retention portion; and in that the rear end of the reservoir is in radial contact with longitudinal ribs formed on an internal face of the tubular wall, given that the internal portion of the pusher device comprises a tubular wall having: - said internal face allowing the rear end of the reservoir to be fixed, such that the internal portion is both in radial contact with the rear end of the reservoir, from the inside, and in radial contact with the tubular body, from the outside, in order to guide the pusher device; and - an external face on which a projection projects radially outward, said projection being located at the front of said lugs (R1, R2) toward the second opening and suitable for pushing on the lugs, whereby the internal portion of the pusher device is retained inside the tubular body. - a pusher device suitable for sliding parallel to the longitudinal axis, comprising an external portion which extends externally relative to the tubular body and an internal portion inserted into the tubular body through the first opening; - a clamp located on the front end side of the tubular body and capable of being clamped on the lead in a clamping position; - a reservoir which extends along the longitudinal axis and is suitable for accommodating at least one lead, the reservoir comprising a rear end surrounded by the internal portion of the pusher device and a front end suitable for moving the clamp when the pusher device slides toward the front end; - said internal face allowing the rear end of the reservoir to be fixed, such that the internal portion is both in radial contact with the rear end of the reservoir, from the inside, and in radial contact with the tubular body, from the outside, in order to guide the pusher device; and - an external face on which a projection projects radially outward, said projection being located at the front of said lugs (R1, R2) toward the second opening and suitable for pushing on the lugs, whereby the internal portion of the pusher device is retained inside the tubular body.