Hi @福島正信 ,
If this is related to Azure Cost Management or Billing then to understand the details of the bill or service for which it is utilized, I recommend contacting Azure billing support team by raising a support request. Here is the link - https://learn.microsoft.com/en-us/azure/azure-portal/supportability/how-to-create-azure-support-request to create support case. The ticket enables you to work closely with the support engineers and get a quick resolution to your issue.