| 摘要 |
A writing implement, wherein elements forming a reverse flow prevention mechanism are formed in rather simple shapes and assembly process for the reverse flow prevention mechanism is rather simplified. The reverse flow prevention mechanism ( 19 ) comprises a valve chamber ( 54 b), an inflow port ( 55 ) opened to the ink storage part ( 16 ) side of the valve chamber ( 54 b), an outflow port ( 56 ) opened to the writing tip ( 17 ) side of the valve chamber ( 54 b), a valve element ( 57 ) stored in the valve chamber ( 54 b), a restricting body ( 58 ) stored in the valve chamber ( 54 b) at a position on the outflow port ( 56 ) side of the valve element ( 57 ), and a valve seat ( 54 c) formed around the inflow port ( 55 ). When the writing tip ( 17 ) is faced upward, the inflow port ( 55 ) is closed by the valve element ( 57 ), and when faced downward, the valve element ( 57 ) is allowed to touch the restricting body ( 58 ) and does not reach the outflow port ( 56 ).
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