Holder, liquid accommodation container that is attachable to and detachable from holder, and liquid ejecting apparatus

A holder to which a liquid accommodation container can be attached or detached, the liquid accommodation container including a front surface portion as one wall surface forming a liquid accommodation chamber for accommodating liquid and a back surface portion facing the front surface as one of the wall surface, and the liquid accommodation container capable of storing liquid to be supplied to the outside, the holder comprising:

• an apparatus side engagement portion which is engaged with a container side restriction portion provided in the front surface portion;
• and
• an opposite wall surface portion which is disposed in a position facing the apparatus side engagement portion with a space capable of accommodating the liquid accommodation container interposed therebetween,
• the opposite wall surface portion has
• a hole portion for inserting a protrusion portion provided in the back surface portion;
• and
• a guide groove for guiding the protrusion portion to the hole portion while restricting the movement of the protrusion portion relative to a width direction of the liquid accommodation container when the liquid accommodation container is mounted, the guide groove being extended upward from the hole portion in a usage posture of the holder.