(57) An ink cartridge (30, 30A, 30B) for installing in a cartridge mounting portion of
a recording apparatus, comprises a body (31, 31A, 31B) having a front side at which
an ink supply portion (37) is located for supplying ink stored in an ink chamber (36)
to an exterior of the ink chamber (36), a rear side located to face the front side,
an upper surface (39) and a bottom surface (41) opposite to the upper surface (39),
the upper surface (39) extending from a front surface (40) positioned at the front
side to a rear surface (42) positioned at the rear side, and wherein the bottom surface
(41) is provided with an engagement portion (90), and a particular interface (46)
positioned substantially adjacent to the ink supply portion (37) at the front side,
wherein the particular interface (46) is configured to be biased by a biasing member
(139) in a specific direction (55). The engagement portion (90) configured to be engaged
with a locking section (108) of a cartridge installation portion (110, 810) for retaining
the body (31, 31A, 31B) in an installed state from moving in the specific direction
(55) against a biasing force of the biasing member (139). The engagement portion comprises
a first guide surface (91) and a second guide surface (92), and wherein the first
guide surface (91) and the bottom surface (41) define a first angle (θ1) therebetween
and the second guide surface (92) and the bottom surface (41) define a second angle
(θ2) therebetween greater than the first angle (θ1).
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