It's not an easy job to take care of so many children.

It's not an easy job to take care of so many children.
由于job是名词,所以后面的to take care of so many children可以是定语或宾补,由于去掉不定式句子完整,所以to take care of so many children是作定语成份,修饰job,这样解释对吗? 如果不对,错在哪了?