| 摘要 |
PROBLEM TO BE SOLVED: To provide an oil meter for a cartridge tank in which an amount of oil can be confirmed even at a dark place and acknowledgement of charge in color at the time of presence and absence of fuel can be performed clearly. SOLUTION: There is provided a cartridge tank in which a sidewall of a cartridge tank 4 near an oil supplying port is provided with a longitudinal hole 23 and this longitudinal hole 23 is provided with an oil member 5 constituted of a transparent member 29 having an inward projected prism 29A, a light accumulating member 8 arranged to face against the prism 29A of this transparent member 29 and a fixed member 6 having a window hole 13 and having the transparent member 29 fixed to the cartridge tank 4. Then, the oil meter 5 is made such that a lateral width of the prism 29A of the transparent member 29 is made narrower than a lateral width of the window hole 13 of the fixed member 6, and a lateral width of the light accumulating member 8 is equal to or more than a lateral width of the window hole 13 of the fixed member 6.
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