sense of security; feeling of safety; peace of mind
A stable feeling that one is safe, protected, or free from worry. Often used when describing environments, relationships, or products that provide reassurance.
This town has good public safety, so I feel a sense of security.
When I'm near him, I feel a strange sense of reassurance.
The teacher's smile gives the students a sense of security.
I gained peace of mind by getting insurance.
There's a reassuring quality to this brand's products.
安心感 is the feeling of security and ease, the opposite of the unsettled, out-of-place feeling described by 違和感.