| 1 | Saturday, 1 January 1955 | New Year's Day | 
| 2 | Sunday, 2 January 1955 | January 2 | 
|  | Monday, 3 January 1955 | New Year's Day (observance) | 
|  | Tuesday, 4 January 1955 | January 2 (observance) | 
| 3 | Monday, 10 January 1955 | Coming of Age Day | 
| 4 | Friday, 11 February 1955 | Foundation Day | 
| 5 | Sunday, 20 March 1955 | Vernal Equinox Day | 
| 6 | Friday, 29 April 1955 | Shōwa Day | 
| 7 | Tuesday, 3 May 1955 | Constitution Memorial Day | 
| 8 | Wednesday, 4 May 1955 | Greenery Day | 
| 9 | Thursday, 5 May 1955 | Children's Day | 
| 10 | Monday, 18 July 1955 | Marine Day | 
| 11 | Monday, 19 September 1955 | Respect-for-Aged Day | 
| 12 | Friday, 23 September 1955 | Autumnal Equinox Day | 
| 13 | Monday, 10 October 1955 | Health and Sports Day | 
| 14 | Thursday, 3 November 1955 | Culture Day | 
| 15 | Wednesday, 23 November 1955 | Labor Thanksgiving Day | 
| 16 | Friday, 23 December 1955 | Emperor's Birthday | 
| 17 | Saturday, 31 December 1955 | New Year's Eve |