The World Data Center (WDC) for Cosmic Rays (WDCCR) was established at the Institute of Physical and Chemical Research (RIKEN) in 1957 as one of the four WDC-D2 centers established in Japan, during the International Geophysical Year (IGY, 1957-1958). The principal task of the WDCCR was to preserve and provide the quality-accessed database of worldwide neutron-monitor (NM) data (pressure-corrected and scale-adjusted 1-hour count rate). The WDCCR was moved to the Solar-Terrestrial Environment Laboratory, Nagoya University (currently, Institute of Space–Earth Environmental Research, Nagoya University), in 1991. Data holdings of WDCCR have been opened in unified formats at https://cidas.isee.nagoya-u.ac.jp/WDCCR/. The total number of available NM stations is 138 as of 2022. Although more than half of these NM stations were closed during the 70-year history of the worldwide NM network, all the data obtained by these stations are preserved and opened by WDCCR. We are keeping also original data sheets submitted by NM stations before the “digital era”. Recently, the majority of NM stations and NM data repositories (NMDB, and IZMIRAN) are opening high time-resolutions data, counts/sec or counts/min respectively. Consistency with the long-term one-hour data held by WDCCR with these high-time resolution data is preserved by adjusting their time scales.