Optical apparatus and imaging apparatus

An imaging apparatus comprising:

• an optical apparatus and an image pickup element configured to capture an image formed by the optical apparatus, the optical apparatus comprising:
• a first holding member configured to hold first engaging members;
• a second holding member configured to hold second engaging members;
• a guide barrel having a straight guide portion with which the first engaging member and the second engaging member are engaged;
• a cam barrel having a cam groove with which the first engaging member and the second engaging member are engaged;
• and
• a biasing member configured to bias the first holding member and the second holding member by one side of the biasing member abutting on a first abutting portion provided on the first holding member and the other side of the biasing member abutting on a second abutting portion provided on the second holding member,
• wherein the first engaging member and the second engaging member are disposed along an optical axis direction;
• and
• wherein the second abutting portion is disposed closer to the first engaging member than the second engaging member in the optical axis direction, and the first abutting portion is disposed closer to the second engaging member than the first engaging member in the optical axis direction.