What is "a room a company provides for eating food" called?
Companies provide a room which has tables and chairs. In some companies, the room may have other things such as refrigerators and microwaves.
I have been calling this place pantry, but I noticed that pantry is actually a storage for food in addition to kitchen.
I want to know what the correct term is to call that place?
They would be a "breakroom", or "break room" a place where staff go when they have their breaks.
http://dictionary.reference.com/browse/breakroom
In the UK I have heard this referred to almost exclusively as the "canteen".
The dictionary definition for canteen states: "a restaurant provided by an organization such as a college, factory, or company for its students or staff."
However, even when working in organisations where there is no food service (nor even a vending machine), I have still heard it referred to in this way.
Lunch room
lunch room
n.
- a room, as in a school or workplace, where light meals or snacks can be bought or where food brought from home may be eaten.
Source
Consider cafeteria.
a lunchroom or dining hall, as in a factory, office, or school, where food is served from counters or dispensed from vending machines OR where food brought from home may be eaten. (Random House)
a dining area, as at a school or office building, where meals may be purchased or brought from home and eaten. (AHD)
In the UK, in government (police/fire service/parks depts) and some industry settings it can be called a 'mess room'. In educational and academic settings it can be referred to as a 'staff room'. In an office setting, 'staff kitchen' or 'office kitchen' are often used. 'Staff dining room' or 'staff lounge' would be clear and generic terms regardless of industry.
UK health and safety law requires that all workplaces over a certain size have 'rest areas' or 'welfare facilities' to heat up and consume food, although those terms are purposefully vague to apply to all industries and types of workplace.