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Standard-setting instruments:

• Labour Standards Act [Law n° 49 of 7 April 1947 as amended through Law n° 104 of 2003].
  Labour Laws of Japan, 1995, Ministry of Labour, Institute of Labour Administration, Tokyo, Japan, 7th ed., ISBN: 4-8452-5115-9, pp. 71-110
  Labour Standards Act, 2003, The Japan Institute for Labour Policy and Training, Tokyo, Japan
  English translation (as amended up to 4 July 2003)
  
  See all the amending texts and implementing texts on ILO website
  
  
• Cabinet Order concerning temporary measures with respect to working hours in section 32, paragraph 1 of the Labour Standards Law [Law n° 49 of 1947]. n° 397, 1987-12-11
  Kampoo, 1987-12-11, n° 18244, p. 2
  Fixes the statutory working hours at 46 hours per week. However, working hours shall remain at 48 per week until 31 March 1991 in enterprises which are engaged in the following activities: mining, transportation, cleaning, meat processing, those in construction or entertainment which regularly employ 300 or fewer workers, those in manufacturing and trade which regularly employ 100 or fewer workers and those engaged in freight handling, cinematography, theatrical performances or health and sanitation services which regularly employ 30 or fewer workers.
  Also provides that in irregular working hours systems, the average working hours per week in a period of less than three months shall be 44 hours or less in enterprises which regularly employ 300 or fewer workers. Statutory hours for children under 15 years of age shall be 42 hours per week (including school hours). 
  Related texts on ILO website