Since 2002, the currency used in the Republic of Ireland is the Euro (€)
The Euro is used in 17 countries, all of which are members of the European Union and you can use the same notes and coins if you are visiting another Euro-zone country before or after Ireland without having to exchange them.
Austria,
Belgium,
Cyprus,
Estonia,
Finland,
France,
Germany,
Greece,
Ireland ,
Italy,
Luxembourg,
Malta,
Netherlands,
Portugal,
Slovakia,
Slovenia,
Spain.