The invention concerns a multi-function writing instrument (10) comprising a body extending in an axial direction (A), at least two writing elements (30, 32, 34, 36) arranged inside the body, each writing element (30, 32, 34, 36) comprising a writing head able to take up a retracted position in which the writing head is stowed in the body (12) and a writing position in which the writing head protrudes from the body, one of the writing elements being a lead-holder system (36) comprising a lead-holder mechanism (36A) and a lead container (36C), the lead container (36C) comprising a side opening for inserting leads (36D).
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