How can I give access to Object manager to a particular user having the profile which not having access to object manager.? Any Alternate way other than assigning System Admin Profile , Also I dont want to change Profile..urgent please
Have a look at "Delegated Administration": https://help.salesforce.com/htviewsolution?id=000004559
Here you can specify which custom objects the user should be allowed to manage.
There is also the permission "View Setup and Configuration" permission which can be assigned via a permission set. This will enable them to access (view only) the setup menu without having to give them the System Admin profile.