PROBLEM TO BE SOLVED: To provide a wearable device that can be worn comfortably for a long time without giving a wearer an oppressive feeling.SOLUTION: A biological information measuring device 1 as a wearable device includes a case part 10, a first band 22 which is a member connected to a first end part 10a of the case part 10 for mounting the case part 10 onto the body of a user, and a second band 24 which is a member connected to a second end part 10b on a side opposite to the first end part 10a of the case part 10 for mounting the case part 10 onto the body of the user. The case part 10 satisfies an inequality of a
