I was idly browsing my RSS reader and came across this article.
“新しい Google Maps Embed API が公開” http://hyper-text.org/archives/2014/03/new_google_maps_embed_api.shtml
I did it as soon as I could!
The Maps Embed API overview | Google for Developers
Easily embed and customize Google Maps on your web page or blog by setting the Google Maps Embed API URL.
Oh, my God, that’s convenient!
There is a little manipulation in setting the public API key, but
一度行ってしまえば簡単。blogパーツとしてはこれでもう十分かも。