Publisher
Noun
しゅっぱんしゃ
その出版社では、入館の際に身分証明書を提示しなければなりません。
You have to show your ID card to enter the publishing company.
If 出版 means publishing, then a company that does said publishing is a publishing company.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own. Will help to know the word 出版 as well, though.