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Based on my attempt below, アルバイト and アルバイト先 have the same meaning of "part-
time job", so why is 先 needed in アルバイト先で ?

The following searching results are intentionally attached here to prove I
have done some effort but I still failed to understand.

  * 先 ![enter image description here](https://i.stack.imgur.com/ncpFO.png)
  * アルバイト ![enter image description here](https://i.stack.imgur.com/74JYt.png)
  * アルバイト先 ![enter image description here](https://i.stack.imgur.com/qJ8ky.png)
  * アルバイトで ![enter image description here](https://i.stack.imgur.com/jJp61.png)
  * アルバイト先で ![enter image description here](https://i.stack.imgur.com/VkIFM.png)
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2015-06-22T13:01:31.330
25239
2015-06-22T13:26:54.567
9896
question
grammar
Why is 先 needed in アルバイト先で?
先 attached in the ending of words usually defines the place where the noun
takes place. アルバイト先 means the place of the part time job. Sometimes Japanese
even say バイト先.
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2015-06-22T13:16:11.580
25241
2015-06-22T13:16:11.580
4419
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answer
There is of course a good reason for using 「[先]{さき}」.

Consider the two sentences below:

「アルバイトでピアノを[弾]{ひ}いた。」= It is your job to play the piano.

「アルバイト **先** でピアノを弾いた。」= There happens to be a piano where you work part-time
and you played it one day. It may have been before, during or after work.
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2015-06-22T13:26:54.567
25242
2015-06-22T13:26:54.567
25239
answer